Obviously many players just go all-in regardless of what GTO says. In reality, especially in freeroll tournaments, when you get deeper in the event many players start playing very tight with short stacks.
Because of that, pushing all-in can be better than it seems, since players fold a lot and you can pick up blinds quite often. But that doesn’t mean you should shove with anything.
Playing aggressively in these stages of the tournament is very important, but you still need to choose your spots well.