Thanks for the nudge, I wrote to the EU registry.

On mobile I use Etar calendar app from f-droid, and DavX to synchronise calendar data. I use syncthing, but not for calendar sync, since the caldav protocol is designed for exactly that. But on the back end, if you want to host your own calendar, I recommend Radicale. It stores its data in simple text files, and works well with syncthing. Radicale.org

My impression is that they pioneered the reusable rocket concept and greatly reduced the price per kg. for sending material into orbit.

However, I personally think they did that despite having Elon, not because of.

The cat and Mouse games between blockers and anti-blockers begins.

I’ve been using adblocker on YouTube for years, but tried to turn it off yesterday as an experiment. Multiple, 40 sec to 60 sec ads on the first video. I knew it was bad, but that still surprised me.

How does anybody live with that level of annoyance?

I can recommend newpipe for android, as an ad free YouTube viewer.

It’s not exactly DIY or RISC, but you might be interested in looking into purism. https://puri.sm

They also try to make or use open source hardware