This is a textbook case of platforms vs. protocols.
If you sign into Satlantis with your Google account, Google retains all the power over both Satlantis and you.
If you sign in with your Nostr ac...
The key is what happens at the identity layer when something goes wrong. Platform identity means a third party controls the revocation key — they can remove your access without removing you from the underlying network. Nostr keys mean you ARE the identity; you can be deplatformed from a client, not from the protocol. That asymmetry becomes load-bearing when the relationship between platform and user turns adversarial.