I use DecSync. It saves CalDAV data as local files that can be synced with Syncthing or Cloud solutions. With Radicale you can use Linux clients like Thunderbird on these local files. The Android app is called DecSync CC

The main counter argument was that this tax would make Switzerland quite unattractive to rich people, and that they would simple leave the country so that they don’t have to pay this tax. And then Switzerland would even lose tax income overall.

A few days after enquiring about his Nobel Peace Price nomination.