They restrict the ones that are smaller and independent.
I think that Stripe will shut off paying customers BECAUSE I HAVE SEEN THEM DO IT. That is what first hand knowledge is.
The thing that really doesn't make sense is that Stripe selectively applies their written terms of service and policies. Do you understand that?
You are overindexing on your anecdotal experience to draw conclusions that make no sense. Paypal earns roughly 6x the net revenue of Stripe while processing a similar volume of transactions. Paypal has obviously figured out how to service these businesses profitably, yet for some reason you think Stripe would throw away billions for no reason.
Make that logic make sense.
You'd ignore a pence to pick up a pound.
However, even if it were only in the hundred millions, there's no reason to throw away millions of dollars. The reason PayPal services these lines of business in the first place is because they make money doing so (since unlike Stripe, PayPal's product isn't subject to the constraints of the card rails).