I mean, things like https://www.theverge.com/2019/6/3/18651344/wwdc-2019-apple-force-ios-developers-sign-in-third-party https://www.theverge.com/2019/6/3/186513

I mean, things like https://www.theverge.com/2019/6/3/18651344/wwdc-2019-apple-force-ios-developers-sign-in-third-party https://www.theverge.com/2019/6/3/18651344/wwdc-2019-apple-f... are definitely gonna run Apple into trouble. This is basically the definition of what is known as "tying". See, https://www.theantitrustattorney.com/antitrust-laws-prohibit-tying-products-services-together-sale/ https://www.theantitrustattorney.com/antitrust-laws-prohibit... for a fairly good description. (This was the claim against MS - tying OS and browser).