Even with filings, I believe it doesnt meant that the company is 100% legit, so there is even risk with that and companies could start using these to fool investors if they believe that this will show their legitimacy. ONLY trading can be done in this space for now or a very very small amount of risk for a long term investment as some will definitely pay off, but many will bite you in the ass. Due to the valuation it is easy to get attached to these companies, but again, it is only worth trading and it will be awhile before that changes. Even if a company ends up being legit until there is more clarity, when there is a big rise, you take a chance of holding and an attack coming to bring the stock price down or the companies could say screw the US investors. So it is even risky to hold what may end up being legit companies