yes, it is dangerous to invest in ico, even though the profit offered are very large but very vulnerable to fraud, in my opinion if you want to invest in ico, all you have to do is research the ico correctly.
Correct research is an impossible story, all can only be researched at a relative level because the source of information from the projects is unclear, what we can consider is just the development team, the plan, whitepaper, and the level of reliability is not too high, quite reliant on luck to invest. And with past projects, luck is quite high, but now, the scope of luck is probably too small, almost projects are just scams, investing in ICO is really difficult, more thorough research also only brings zero in the results