I do not think that there is anyway at least one honest cryptocurrency exchange, and I dont advise anyone to keep funds on the exchanges all the time.
Even any of the 10 exchanges listed by you can be hacked at any time or end up with fraud at a certain moment.
In this point I agree with you
IF you Don't have key you don't have coinIt seems like this "if you are not holding the private key then, the coins does not belong to you". We can't blame people who doubted now with some exchanges, even though they are look likes legit now. Because recently we have crypto exchanges that victims of hacking and exit scam by the owner. I did not say in generalized but that was the point of view now from crypto trader. However, trading is still profitable.
As a trader, you wont really have any choice but to deal that kind of risk on where putting up funds into exchangers which you do know that you dont possess the keys of its wallet.
We are already fully aware on that one thats the corresponding risk been tied up but well you wouldnt mind it too much when you do plan to trade on the first place.
About on the 10 platforms mentioned, im not really against to it yet these are the most top tier ones but some of them do have some reports of fake volumes so it isnt really that accurate.