We already have that, it’s called prison. Can’t go on the internet from Prison (at least I’d assume so, wouldn’t make much sense if people could). That’s not 100% since people need to be caught for it to work but once they are it certainly is.
Though other Global ban solutions don’t really work well because they require a certain level of compliance that criminals aren’t going to follow though with (i.e. Not commiting identity theft). They can also be abused by malicious actors to falsely ban people (especially with the whole identity theft thing).