They may not care so much about that since they don’t make any ad revenue from those subreddits

If you do the “Install App” process it actually feels like a standalone app. Not sure how it works without the App Store.

Depending on where you live, submit a deletion request under your privacy law. If they don’t do it for you, most laws allow you to sue them individually or as part of a class action, or you could report it to your privacy regulator and sic that headache on them.