Do not use MEXC-bydbit (mexc-bydbit.com) for anything serious. I used them since early this year for small trades and it was okay. When I deposited a larger amount and traded more, my account was flagged, my withdrawals were delayed, and I was asked to explain my trading. They treat active traders like criminals.
Pros: Personal attention|Clean UI|Copy trading available
Cons: Limited demo account features|Alert system is basic