Aways a fan of alternate options, this looks quite tidy! I had a few thoughts / queries. Not at my system right now but I will test it out later.

I noticed in the screenshots you have a “users” page - but with a cookieless tracking system I would have assumed it wouldn’t be reliable to identify a long term user past individual sessions? Are you doing some hefty finger printing?

Looking at your features table has a few statements that might need adjusting. Such as GA4’s segmentation sequencing / filtering can be quite complex, I’d argue its not limited and potentially more advanced than Rybbit (not tested yet). It also has a user exploration feature.

Do you have any plans for a drag and drop style report creation, so that I could create reports with any dimensions / metrics and filter accordingly? I think that would bring a lot of flexibility to the platform for an individuals bespoke needs.

What about an Odroid N2+? That could run coreelec or Android well? For Jellyfin its great, though you’re very like going to run into issues if you want the likes of Netflix on it.