Let's call out the shadiest exchange, Bitbns.
I'm one of their users, watching their exchange closely for the last couple of months. Here are the things that I've noticed:
1) No large outward transactions from their hot wallet. Example: USDT on TRX, BSC, ETH, and MATIC.
I have used both Bitbns and onramp. You are working hard on onramp to make a successful product, but there are users who are stuck with a hefty amount in Bitbns. If you are going to abandon them like this, I can assure you that onramp will be going nowhere.