US competition laws are outdated with undue reliance on the concept of a monopoly.
I don't care if you're a monopoly or a third of the market or even a small company. If you run a marketplace or app store or similar platform, you should NOT be able to:
- Force usage of a separate product of yours over/with competitors (in this case, Apple sign-in, but also Apple Pay instead of Google Pay, etc.)
- Prevent competing products from appearing (whether Apple not allowing other browser rendering engines, Amazon not allowing Google Home or Chromecast to be sold, etc.)
- Rank your own items higher in search results etc. if competitors can't bid to do the same e.g. sponsored results for everyone including yourself (so Amazon Basics or Google Shopping needs to be listed as a sponsored result, not as a separate feature)
This is the kind of thing 21st-century legislation for fair competition should address.