I keep seeing on nostr you own your data, but that's not really true. Any relay that stores your notes owns your data. That's good for censorship resistance but terrible for opsec. They're juxtaposed.
You own your identity. The data is public
Yes, but you can carry your identity with you in ways you can't with twitter or the rest of walled garden en-shittification-land. So, to your point you own your ident, on nostr.