one more thing to look out for is the age of the exchange. be wary of exchanges that have only existed for a few months. even be more careful when you are one of the first few customers. scammers don't often last that long since they want the profit asap and they dont want to spend even more money anymore. the most it will last would probably be a year.
If they are at early age, for sure, they have very small liquidity and would be hard to execute a trade of your price because it might take long to happen. So it is like waiting in vain. Better trade in bigger exchanges with known reputation so you won't have trouble waiting for your funds.
Just few warning signals in my opinion -
> offering too-good-to-be-true perks
> very little liquidity
> no one is talking about this exchange
> someone is creating a hype out of nowhere