At least in my experience, I don't see any pressure to not submit if you don't review (I'm in ML though, so could be different in other fields).
I think why people review is:
-You should be reading more papers anyway and we like doing it, so why not take it as an obligation?
-I assume that eventually it helps one to get selected to be an area chair or something along those lines.
I think why people review is: -You should be reading more papers anyway and we like doing it, so why not take it as an obligation? -I assume that eventually it helps one to get selected to be an area chair or something along those lines.