I want to say that investor, I mean those ones, who are professional, always were very attentive and spent a lot of money to learn everything about the project they wanted to invest in.
of course, because spending a lot of money to get far greater profits in the future is not a problem
rather than having to suffer losses due to wrong choice in the project
they would be very careful not to get caught up in scam projects
My friend has lost 2 btc when he invested in a project without any researching of its power. he thought that hype is the most important thing.