As popular as PayPal may be, it's a far cry from being a monopoly.
That said, I do think holding money should be cause for more stringent regulations. Stopping service is one thing; holding funds entirely should absolutely happen only under direct court order (anything else would be theft).
Counterpoint: The “market system” is already a fiction, and contesting the laws to further promulgate that fiction is a non-starter. Calling a business a somethingnotquitea-monopoly isn’t an incantation that makes it true or legally sound.
That said, I do think holding money should be cause for more stringent regulations. Stopping service is one thing; holding funds entirely should absolutely happen only under direct court order (anything else would be theft).