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Maybe they are getting sued or under investigation and PayPal dedicated to kick them because they got subpoena to testify or similar.

And these scary letters from gov will sometime clearly state what SaaS provider needs to answer when person ask "why I'm banned". Sometimes, the court or investigator will explicitly ask not to ban user and they can ban user only after investigation is finished (or grand jury makes decision if it is something more complex).

I would not fly to US if I'm one of them....