According to their page it’s a pure searxng instance. I didn’t see anything on my own instance changing so there are three options I see:

• The mentioned server side changes (e.g. A server move you mentioned but could also be server settings, provider settings, etc).
• client side changes: somehow your Firefox provides different information to alter the results
• subjective change: it’s always a possibility that either what you searched or your perception was more fine tuned to Cyrillic.

And then there’s the obligatory “none or all of the above”.

Personally I’d guess it’s just a fluke. I gave it a few searches from Firefox mobile on “all languages” and had a mix of mainly English and a bit of German und French in there as results.

Edit: if you’re comfortable with that feel free to share some search terms and we can compare results. Would be curious myself!

As they are closed source no one can tell you their true privacy policy. It seems better than average from what I’ve read but you never know…

Personally I use logseq and sync the files via a Nextcloud instance. I can only recommend it, although I also recommend spending an hour to learn the tagging and linking logic and reading through their guide on what’s possible. I still only leverage a minor part of the potential myself.

One that is closer to onenote (I think, never used onenote) is Joplin.

It literally is!