I can tell you first-hand (from the side doing the banning) that you’re wrong.

You’re not going to get an email telling you that you’re banned. Your payments will just start being declined, and they won’t be able to help you. They’ll suggest you try another card. That won’t work either.

Maxmind includes a “chargeback risk score” in the api response for everybody who uses their minfraud service. They’re not doing that because companies don’t use it.