Even when bank management know and accept your business model, as my Citifolk did in Texas, the riskfolk shut down the operation after processing about 17 million over 3 years. As you note, there is no legal reason to do so.

I did not bother to talk to the riskfolk then as I always maintain at least a half dozen banking relationships so my cash flow never was impeded.

In the case of one of my credit unions, I had a long talk with their risk officer about my business model and she understood the dynamic of the business, legality of it, and the fact that it did not involve any of their bank cards. However, because her analytical tool was flagging the account and she was concerned about having to deal with bank auditors, she politely asked me to switch the operation to another institution. No account shutdowns, no closure any accounts, including address related accounts for my SO and kiddo.

Understand we are just bycatch to risk management, the dolphins caught in the tuna fishing nets. Nothing personal, but we are a bit of a back office nuisance.

Shifting gears, to understand the real nature of the customers bankers prefer type Wells Fargo loves baby seals into your Google secret decoder ring.