My personal opinion is that an individual has to take responsibility for their decisions and actions.
Lots of people may feel tricked by investing into cryptocurrency and then watching it go down.
The desire to punish someone or something, like for ex. initiating a lawsuit is in a way shifting of responsibility outside of oneself.
Established financial markets like foreign exchange put a message on every page warning that - most traders lose money on the market.
Such messages may start popping up on crypto-exchanges sites.