Hey, welcome to the forum.
First, you need to know, don't make a new post consecutively for each reply, it can all fit in one post. At the same time, it is also against the rules of the forum.
However, if a person sends cryptocurrencies listed in a blacklisted database or the transactions appear suspicious and related to suspicious activity, JokerChange will automatically verify the funds and request KYC.
Yes, some users can be automatically blocked by KYC even if they are not linked to this, in order to maintain control and prevent some users from using the service to launder money.
Why don't you just refund the funds back, instead of blocking them?
The policy of freezing funds is certainly a bad decision, and the user should have confidence in you to give you their personal information and explain where the funds come from. For me, this is too much for someone without a well-known reputation, you can hardly deserve a recommendation.
btw. don't compare yourself to Binance, you are not the same type of exchange service.