

It is, that said it isn’t supposed to be revoked willy nilly because it removes incentive to get it in the first place and the government wants legal immigrants not illegal ones. It’s the same reason arrests at immigration court are ass backwards unless your intent is to scare people away from attending their hearings so they can then be arrested for missing hearings.
There are qualifying crimes but they still go through immigration court that basically put it on paper and determine when and where they’ll be deported or if they’re going to be granted a waiver for whatever reason.
Yes. Same basic structure certain crimes are qualifying most are not. The Canadian center for refugees has sort of an fyi of you’re curious.
And yes most countries have the same basic structure and even citizens can have their citizenship revoked for certain crimes usually like treason and the like and be forced into statelessness.