[TechBro8615]

My understanding is that they do, but there are some caveats. For example the feature that tells you if 2fa is available for a website presumably requires sending an HTTP request to 1Password servers including the domain of the website.

Although it's possible they implement this with a local bloom filter or something. I'm just speculating. And either way, those requests would only end up stored in some server logs somewhere, rather than in a database row directly linked to your vault.

EDIT: It is in fact done locally. :) see: https://support.1password.com/watchtower-privacy/