As for Terra, if I'm not mistaken, Do Kwon is already under investigation by the S. Korean government.
Do Kwon was asked to appear before the Korean legislative assembly and I like it that he was summoned. And if he is found guilty he should be sent to prison without any waste of time. Enough of scams in this industry. It is killing the faith of people in cryptos.
And yes I remember Onecoin. I heard of it in this forum when I joined here. Alot of us newbies thought it was next to bitcoin. But like you, I did not invest in it then too because I had no money, and not because i knew it was a scam. Then I never knew my left from my right.