Laurie Vosshttps://zeitgeist.blue is a multi-social-network app that summarizes your feed for the last 24 hours to let you catch up with doomscrolling. Now with support for Mastodon!
Jan Lehnardt 
@seldo how can I make sure my posts are never used by this app to be sent to an LLM vendor?
@janl You would need to block me from following you, I suppose.
@seldo you personally or some app account?
(Note that this kind of stuff is not well liked here on mastodon, I got browbeaten into shutting down just a search engine that worked that way, let alone exfiltrate a timeline into an LLM provider)
@janl Me personally, and also anyone who uses the app. It's just a mastodon client, fetching the timeline. It looks like every other mastodon client.
@seldo yes I know. I’ve written about my experiences extensively: https://searchtodon.social/Adventures-in-Mastoland.html
Aurynn Shaw
Alex@aurynn from looking at it, seems that'd be pretty hard. It's authing using tokens into the users fedi account, and then pulling the feed from there rather than reaching out to our servers... as a result you'd only see the UA if a member of your server was using it - which seems unlikely... pretty crappy of them to do that.
Edit: What I also do not see mentioned on the site at all is that this can and will be able to see DM's if you auth with it.