Or most banks, government apps, and so on. Which all require an app to login, rather than support any open and actually secure standard.
I guarantee the government is not forcing 95-year-old Betsy in bumfuck nowhere with no cell coverage to learn how to use a phone. They have some solution, they're just not making it obvious.
I just called the solicitor, said "my Dad hates the app", they immediately presented an alternative.
And generally, 99% of stuff exists in browser. My phone is for messaging, photos, and reading, very little else.