Then you’re an uninformed fool.

Apple’s presence is good because it’s a privacy anonymizing service that obscures your email and forwards anything to an email of your choice and logins/connections can be deleted at any time.

And it was introduced in response to the long existing proliferation of login with Google and Facebook and similar schemes. They forced it using their App Store because otherwise no company would go for the user identity obfuscation over the already existed for years privacy invasive alternatives. Apple came late and forced companies to allow their privacy obfuscation alternative. Note: though it often is more private some sites can request additional data from Apple same as from Google and Facebook such as your name. Apple is no worse and often better overall as a choice just the same.