What constitutes Usage Data. Is it sharing the posts I view, communities I subscribe to etc?
Does paying for a premium version stop this data being collected?
The exact same for me, and I had just made a new account to use with sync for lemmy - logged in via sync, then read the privacy policy, logged out, and closed the app. I was crushed because now I couldn’t even use the cool username I signed up with anywhere else either because now the admachines already knew it and probably already attached it to my device ID.
GA collects very limited information by default. You have to go pretty far out of your way to give Google usernames, posts, etc for ad purposes. It’s likely the only thing they received was a device identifier generated specifically for the new install of the app. You’re fine.
You most likely can use the account, unless the author is intentionally doing something shady, Google doesn’t know your username from this interaction.
Google doesn’t know the username of someone logged in? I thought that might be the first piece of data that Google picks up.
They have no way to know it, unless the author of the web or app lets them know.