Hi. If you have a time please read mentioned post: https://blog.dev.openhive.network/hive-139531/@thebeedevs/decentralized-google-login
It explains the big difference in usual soutions matching social and blockchain accounts where usually some server-side application knows the association. Here only you knows which Hive account and keys have been used to setup the wallet, which is stored at Google storage specific to your account. Data are encrypted at client side, using your password - no one can read it then.
Privacy and transparency is one of our goals and I hope this solution will also match your needs...