Also just because you have never been scammed by a platform does not mean it's not scam when other people make complaints about it. They could just carrying out selective scamming. Yobit or Hotbtc for example have never scammed me but I am well aware they have scammed so many people because of the so many legit scam accusations made against them.
If any exchange has scam accusation that doesn't mean that they have scammed or they arr scammer. We can create scam accusation but there shoukd have proven document for which we can adress that as scammer. Many people may face problem for their own fault but they never mention that. For example you took 10$ bonus for referring your friend into coinbase. Latter coinbase came to know both account is operat8ng from the same person. Then who will be the scammer? See my trust page you will see many people gave me negative trust. Does that mean I am a scammer??