I'm sympathetic to the position that Apple could, if they chose, have made a version of iMessage for Android.

But your position that it is somehow uniquely evil just reads as a coping mechanism—a way of not having to blame your friends and family for being shitty for you.

I know plenty of "regular, non-tech people" who understand perfectly well that a) different computer systems do not work properly together, and b) if you choosing to use a particular computer system excludes someone because they do not have access to it, that's rude, discriminatory, and generally shitty behavior.

SMS not having the same features as iMessage is a technical issue, sure.

Apple not providing iMessage on Android was a business decision, no question.

But people being exclusionary and obnoxious to each other over group chats is a social issue, and should be treated as such, and not blamed on either the technical or business side of things.