The worst thing about WMM is perhaps not its files in themselves, but the fact that anyone has access to too many of them.
As admitted by others, some files on the site may, or even intend to, cause serious mental illness. See Catgirl's and Jocoburline's messages Nov.7th 2010 in the thread "Files causing mental illness"/General hypnosis. I fully agree so far. Even if a file doesn't explicitly suggest that you become depressed, this effect may very well occur.
Listening to WMM files in my case has caused depression, which is in itself a very serious thing, plus stress symptoms like headache, bad stomach, insomnia and severe esquema. My psychologist told me that addiction to hypnosis stuff on the net is psychologically about the same thing as addiction to alcohol and drugs. Scientists know that problems regarding dependency/ trying to quit cause higher bloodpressure and other stress symptoms. (Acording to a long article on the net, which unfortunately I can't refind, written by a hypno dom and psychologist (not Peter Masters), the mental pressure on the sub has significant stress effects on him or her.)
Any tist on this site of obvious reasons stresses the fact that the subject is responsible for his or her own actions. Yes, I agree, however adding: So are the tists. But what do they do? On Hypno-Fetish EMG admits that his favourite is to slowly break a person down until (s)he will do anything he desires. And the content of his and other files speaks for them. The "listen, obey and relax" mantra is introduced at an early stage to condition the subject to what may easily follow after some time: blank mind, heavy suppression of free will, dominance etc.
And many of these files may be listened to by anyone anytime. In some cases this is like giving alcohol to an alcoholic. EMG states that due to the nature of the internet it is actually impossible to lock a person out of a website. Does this mean that he isn't able to prevent pirates from collecting personal information about each one of us? And what about the "alcoholics" and others (teen-agers) who shouldn't be on the site?
EMG and many others on WMM are - or may very well be - creating victims by their hypnotizing files. Under trance they suggest that the subject is giving up his control and/or has no free will etc. And when both tist and subject have woken up from trance, the tist states that of course the subject has a free will, ignoring posthypnotic suggestions given and alike. Hynosis, though, is not a question of either or. There is a gradual development from one level to the other. The tists know this and use it systematically (and not seldom evilly) through the whole process from the very beginning. And when something goes wrong, they may deny what has been going on. The dangers combined with the use of hypnosis have led to restrictions in the legislations. Some websites, however, are administered by irresponsible hypnotists whose concern is not primarily law and ethics, but pleasure for those who can bear it. WMM must be a paradise for the unethical hypnotist. The anonymity on the net prevents the tists from being confronted with the wounds they create. The tist may just state that the subject alone is responsible for the problems which the tist has participated strongly in giving him, and then move on to the next victim. In person sessions (not via Skype) at least give the tist an opportunity to get to know the subject first and then to notice the changes that the trance eventually makes.
It is too easy to say that because a person listens to certain files on WMM, (s)he wants their suggestions to come true. This (what I referred to) is just and only an attempt on conversational hypnosis. A sub may agree to some of the suggestions, but not all of them. And he can agree to them sometimes, but not always. He may also want, or dream of, something resembling the tist's suggestions.
To the question on which files may cause mental or other illness, I would answer that it doesn't depend on the file necessarily, but on the person listening to them, and on what state (s)he is in, happy or not, heavily entranced or not etc. And I cannot see how it is possible to submit to the files on a long term basis without becoming rather seriously depressed or ill. On a long term basis - that means that some level of dependency or addiction may very well be involved. And addiction is often linked to depression.
Therefore I do find it irresponsible that a person trying to forget the traumas connected with WMM, cannot be locked effectively out of EMG's websites. The legality of erotic, mind control hypnosis on the net is generally a matter for the authorities. My point here is to speak for blocking of the access to EMG's websites for those subjects who (admit themselves that they) don't fit in or shouldn't be there. And I can't see why that should be impossible. If you have to pay via the net for services offered there, you have to give someone your identity, which means a possibility to limit the access. And don't just say that any technique has its weaknesses, that answer is too easy.