I saw it, of cource they didnt publish no apk or aab. I dont think a lot of people will compile from the source code, maybe like 0.05% of users

Its restricted by legitimate interest - see process Google vs Spain

It doesnt delete an account, it makes account invisible. To wipe data people can try to send gdpr request to DPO, by my experience most of the Big companies doesnt satisfy such requests based on broad meaning of “legitimate interest” “fraud prevention” “implement security measures” “protect others users”

I already have like 6 complaint to DPA for companies refusing to delete data

Try to ask your friend to make this operations for you so you will not use not libre software

Why its not available as apk or aab or on fdroid?

Promoting play store?

Posteo.de