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1 year agoTotally negligible. All you need to keep is a line in a database with the person’s email, hashed and salted password, and a unique identifier for each game they own - that’s an amount of space that won’t even register on any service nowadays. There might be other optional stuff that takes more space, like display pics, cloud saves etc but you can delete those without deleting the whole account.
The web client supports it too, as do other apps like Tusky and Ivory. The official app is just a weird outlier.