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?
They can’t verify our citizenships. They just have to comply.
legal grounds? no, I don’t think so