Does somebody use the "earn interest" feature? Does it really work? Are there some "hidden" problems (ex. difficoult withdrawals, surprise KYC etc...)?
it works without any problem , you will be getting your interest paid at a random time everyday and you can withdraw whenever you want easily
I can second that easily. It works automatically, and is compounding so you never need to to anything to reinvest, your entire balance is credited. Only that it is random so you could have it very late or very early, not necessarily 24 hours apart.
Hidden problems have never happened at this site. Over 2 years using it for me, any amount big or small.
I still wouldn't recommend you to put big amounts. "big amounts" may vary from person to person so I won't name a price. You should probably think percentage-wise.
This is a 1 (or a few) guy(s) operation. If something unexpected happens (like a hack) the chances are very slim for you to get your money back. The yearly %4 interest is very good but don't confuse this website for a bank. Just telling, It all depends on your risk appetite in the end.