part of your comment is what i have been saying for years! but i don't agree with the "obligation" part. basically for years altcoins and now ICOs have been receiving free money, former through premining and other shenanigans, and the later through I.C.O. and then delivering absolutely nothing apart from another useless token to be added to thousands of other useless tokens and eventually end up in the graveyard.
there is no obligation because you get what you see, if people choose to see something apart from the reality that is their own fault. and because they are not companies, they are random people, most of them kids, releasing a token which you know is useless.
also, what you described is not fraud. Fraud is when a person is deceitful for financial or personal gain. You taking a loss because you were "convinced maliciously" to "decrease your value" is your own personal choice. Just as you're free to intimidate people with lawsuits and misrepresent peoples actions to look like they've commited a crime.
in a way it is fraud.
for example imagine an ICO token which is saying it is going to fix the energy problems, an ICO that is saying it is being used by medical sector for doctors and patients connecting to each other and having their information stored on the blockchain,.... (these are actual ICOs). then in reality all they do is that they create a useless token which will be traded on exchanges for a while and die eventually.
the team who gave all these promises will stop doing anything apart from coding the smart contract creating that token and going away as soon as they got paid.
this is the classic definition of being deceitful and performing a fraud.