Can you give examples of this? What is the coat to the end user? Hardware, IT-services (VPS, and alike?) or like map providers using OSM data?

Yes I’ve switched just recently. Just hope it gets continued development and didn’t just count on the original app.

No Syncthing is perfect. The problem is the Android app development issue. The main all had it last update ever earlier this month.

I’d suggest that you try it. It’s less advanced but nicer looking. Not sure about the condition of the adreaa data in the US.

Antennapod and Organic Maps to keep it simple. They are great for daily use.