It exists!
https://github.com/michelcrypt4d4mus/fedialgo_demo_app_foryoufeed

Not sure if this is what you found already, you should be able to log in to your usual instance then use it in the same browser without sending anyone your credentials. Or self host if you prefer.

is it global trending or personal feed? thanks

Different software can do this in a less privacy invasive way.

NodeBB has "popular" filters that show you what is generating discussion (per day, week, month, etc.)

doesn't that make the situation worse with a busier feed??

I searched for nodebb.. it is just forum hosting?

@ntn888@lemmy.ml yep, it's a forum you can self host.

GitHub - NodeBB/NodeBB: Node.js based forum software built for the modern web

Node.js based forum software built for the modern web - NodeBB/NodeBB

GitHub (github.com)

Or join activitypub.space (but that one is geared toward fediverse developers)

it doesn't look like it's federated.. let alone linked to mastodon?

It's global trending. Which I find unfortunate, because it basically defeats a purpose of thematic servers. For example I'm on Polish server, full of people taking in Polish, but I see only global trends which are not at all in Polish 🫤

You'll find more of what you like too

I'm talking to you from it right now 🤨