Paypal isn't accepted by all. Many services don't accept it because of their strict policies and many individual users, who were scammed with chargebacks stopped using them.
Basically  there are at least 3 main issues with Paypal:
1. Banning users with "suspicious activity" and this involves crypto businesses.
2. Chargeback scams
3. Typical corporate attitude towards customers. "we don't have to explain our decisions, all decisions are final, your funds were blocked, fuck off"