People use PayPal from person to person for B/S/T forums. The PayPal user base is bigger in this community because anyone can accept payments without being a merchant, yet unlike dealing over Venmo there are still protections for the buyer.
Also, accepting payments worldwide is much more feasible. Stripe is in 25 countries [1]; PayPal is in 200 [2].
[1]: https://stripe.com/global
[2]: https://www.paypal.com/us/webapps/mpp/country-worldwide
Customers can pay through Visa whether they have a credit card or not:
https://en.wikipedia.org/wiki/Visa_Electron
https://en.wikipedia.org/wiki/Visa_Debit
As far as I can tell it might be only USA banks that don't issue these kinds of cards as standard, in place of a bank card.
I'm not sure about other countries but in the US, it is possible to open a bank account without a debit card attached to it.
For instance, https://www.paypal-cash.com/index.html
People here get useless Maestro debit cards. You can only get Visa/Mastercard credit cards. And very few people do, usually only people who travel to the US bother.
Not having a credit card is the main reason I see for people requesting PayPal (they may also prefer it if they already have an account, but that's not a deal breaker).
Thats depends a lot on the country though. Not accepting PayPal in Germany would probably be the same as not accepting credit card in the US. In the UK however only offering credit cards might work.
There's 0 domestic use cases for PayPal there. Other parts of Europe I'm not so sure about.
Good to know, though.
Also, PP makes my accounting extremely easy. I use my PP debit card for all of my business purchases, so I just download a CSV of the entire year's transactions, and compute my results in a spreadsheet, for my taxes.
Given the horror stories, I realize it's a risk, and I periodically go out and look for alternatives. Best case would be to have two options for customers, so my business could at least take orders even if one of the two goes down.