Thank you for sharing the story! I hope OpenFreeMap can contribute either with the MBTiles / Btrfs dumps, or with the public instance.
My only feedback on your tiles is the lack of POIs. Mostly just bus stops and an occasional supermarket in my area. But I see from the github that this is on the roadmap.
For POIs, they are present in the data, it's just that the styles might not have the matching icons for them. But you can always make them into a circle, etc.
Having said that, working on the styles is a big and never ending effort, so if someone would like to help with matching the POIs then contributors welcome.