I agree with the sentiment, but the reason they're looking at third party apps is to avoid the control that payment processing companies have over censorship following the whole Visa/MasterCard issue.

Because, even if you do have a fully functional credit card which is not a given in many countries, US-based CC payment processors like Stripe are equally horrible third-party companies that gobble up all the data they can get their hands on somehow.

Seriously. You cannot even start "free trials" on US-based websites without handing over everything a bad actor would need for fraud or even identity theft.

Because it most of the world you'll be dependent on Visa or Mastecard, US companies that have been exerting their power to effectively block payments to content they deem inappropriate, such as adult websites.

In a lot of countries you cannot just use your debit card directly on Steam like you would a credit card which includes just entering the numbers and you are good to go. Or in some cases it directs you to the credit card provider where you have to authenticate the payment.

Here in NL we have to use iDeal if we want to pay online with most banks, this requires us to 2FA the payment by scanning a code using their app. iDeal will become Wero and will become an international system since a lot of countries had something similar to the Dutch iDeal.

Unless you have a debit card from a third world country bank and half of the time for online payment the authorization fail.

I've been in this situation several times and then though I don't like it Paypal has often been the only payment option available to me.

Some people launder their money. It was the only I could send money out of the country without too many hoops to jump

Because its not really secure

Because typing in bank details every time is a pain and saving them is a big no no as many companies seem to get hacked. Trusting only 1 company with bank details limits the blast radius.