GlossaSub has no user accounts; we only know you by an anonymous ID.
Data on your device (PSN session, PS5 pairing, TV, your own keys, settings): deleted immediately with Settings › Devices › Redo Setup, or by deleting the app.
Data on our server (anonymous ID, usage statistics, support messages): in the app, write "Please delete my data" in Settings › Support and feedback (the form identifies you), or e-mail app@glossasub.com. It is deleted within 30 days, except purchase records we must keep by law.
Subscription: deleting data does not cancel a subscription. Cancel it in Subscriptions in your App Store or Google Play account.
Usage statistics and support messages are in any case kept for at most 24 months.