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Right now what I hate is the fact that I don't have access to the private keys of my funds, I don't feel secure because of that.
Why sign up to these centralized exchanges in the first place? Before signing up, you are asked to agree to the terms. Somewhere in there says that they keep your private keys, so why agree? Stay with DEX if you're unhappy.
Also, I would for the process to be simplified and streamlined, I want to buy crypto with Fiat as easily as I buy stuff on Amazon.
There are already OTC exchanges like Coinbase.
For suggestions:
Add more customer support
Some exchanges do not have dark mode, I wish everyone would have that.