I remember mrai. Damn I made quite a lot doing that, I just held and poof. Some people even paid others to do the work for them and so many foolish people did it... lol then a few days after the pieces goes up hahaha. I wish I had bought some from other people. I got most of them myself near the start. I am a bit more aggressive with investments now. If I see something tangible I go for it. Deep onion was something based on an idea but an idea with a backing. The idea spawned its own forum with like minded people. That is a hell of a lot more then most projects do. So I think if you see stuff like that going down its time to quitely invest and like slip away. Then come back with a massive stash when the price is right like a ninja!!
PS. Please check your inbox talking about mrai there is something you might have interest in.
Oh and if you don't trust the links I send you I won't take it personally ^^ You can simply just google and find what you need but I gave you the links anyway.
So just be aware of people that do try get you to click links that will phish your account.
Mrai was the bomb, I admit I mostly did it for other people (I solve captcha for them and they paid me for the work), so I got a lot of BTC from there early on, but of course I eventually sold my own that I collected for myself and that wasn't even at 50% of ATH but it was one of the big wins for my alts. And practically no money wasted because it was solving captchas in free time.