In most nordic countries, we have a single payment app that's been codeveloped by the major banks. everyone has the app and it's automatically connected to your checking account. We also have easy direct bank-to-bank money transfers at every bank. Most online stores in Sweden also use Klarna which saves your credit card information for you across all sites.

I think it's one thing to be the one stop shop for a single category of goods, but when one company tries to to be in every pie, it crashes and burns. Look at how much of a mess AWS is, or how Google closes a service every few months, or how Facebook is a cluttered mess.

Low barrier to entry can be good, but you're just opening yourself to exponentially more competition by trying to be in every market.