No, I've worked a bit with banking fraud and money laundering, if we'll "fire" a customer, we won't provide any specifics.

Pointing out specific behavior is appropriate if you want people to change that behavior. But in such cases we don't want them to start working differently, we want to stop doing business with them. We don't want them to create a new company and try to do the same thing more carefully and keep within our detection limits, that's not a success, that would be a failure of our detection, we want to keep them and people like them out, preferably forever, and preferably with minimum expenditure of resources to keep them out. The same probably applies to Google.

if a bank fire you, there a lots of other banks that provide the exact same service.

If google fire you, you can close your company and fire all your employees.

No, they won’t. They can close any accounts without a notice or reason.

https://www.helpwithmybank.gov/help-topics/bank-accounts/ope...

"If you believe your account was wrongfully closed, you can file a written complaint with the Office of the Comptroller's (OCC) Customer Assistance Group."

Yes, and with Google you can also appeal. Problem is the same, though - you don’t know why the decision was made and don’t have the full view of the problem.

What do they do with the balance in the account when that happens?

Nah, if they suspect you of fraud they're barely allowed to talk to you outside of confirming your account has been suspended