I must have come across that exchange back then a couple of times though I never personally used it or traded there. Given the time span, a lot can change especially with the fact that waves lost the hype
Is there any particular reason you want to use this exchange?
A quick search about "Tidex scam" brings about a number of results worth reading
I opened an account with Wave Hipe and loaded some coins onto it, but completely forgot about it. Now I wanted to log in, but first I had to fill out a form. I received permission, but I couldn't make any transactions. They say the account will only be activated if I deposit another 3% of my current crypto balance.