Even with all exchanges on the market, im not satisfied at all, i remember one time i was reading an article someone had his account locked from that HitBTC exchange for 6 months with 12 BTC, asking for KYC and even that he sent all documents he was just getting random emails from the support team, keep in mind that HitBTC is one of the largest exchanges on the market, i don't trust any exchanger , Not You Keys , Not Your Coins.
6 months is like an eternity in the cryptocurrency market.
And as to "not your keys, not your coins" - 101: never keep on any exchange more BTC (or any other crypto) than you need to use at this very moment. Use a cold/hardware wallet to store your crypto as safely as possible.