Earlier quoted context omitted.
It's going to be a hell for the users and the smaller developers. Devs will have to support multiple platforms, different API and options. Also different legal arrangements would be needed as each country has different laws and processes. Remember the agreements and forms we fill for different countries when we want to sell paid apps/features on App Store? I also can't wait to pay account fees for many app stores and…
“Allow other payment platforms” is not the same as “Demand devs to support them all”, I don’t know between which lines you must have read it.
You only support them if you want to reach the customers. That's exactly the same as not supporting Android or iOS or not getting into App Development in first place.