Not only is this a way for you to keep your stuff, inform you what reddit knew about you and in general good to do with services you use every now and then - it also tends to be quite expensive operation for tech companies that aren’t quite operationally mature yet.
In other words, strongly recommend making a request if you still have an account.
do we have any grounds to request our data if we are not citzens of California or the EU?
legal grounds? no, I don’t think so
They can’t verify our citizenships. They just have to comply.