Yeah, that's Apple actively degrading the user experience on both sides specifically because one side isn't their customer. To the point that the color itself violates their own accessibility guidelines.

This effectively attempts to lock people into their ecosystem, including their App Store, and it's... honestly kind of wild to me (as an American, for GP's reference) that we've been allowing this to continue, in a country with a specific history of using antitrust law to go after phone companies for abusing their network effect to create monopolies.