Why would they not? This is effectively buying Bitcoin, slowly, at a discount (they'll surely slap hefty fees/unfavorable exchange rates on it, because there are many people who will happily pay extra for the privilege of paying with crypto, just like people will pay a lot more for anything slapped with an "organic" label).
Tesla, a publicly traded company, got away with buying $1.5 billion in Bitcoin just fine.
PayPal can also sell that Bitcoin to customers who want to buy Bitcoin.