They can get away with it because iOS users have a higher propensity to pay than any other platform. So it's often not a good idea to stop caring about iOS, assuming you want to make money, anyway. Even if you don't, iOS users are just different from Android and web, so they're often desirable regardless.

Many problems in article are specific to old versions of iOS which is only in old versions of iPhone. Most old iPhone users are not potential paying customers. iOS need to be supported but old versions of iOS don't.