I haven’t tested the spouse approval factor, but once Radicale is setup, you don’t have to do anything other than create new calendars through a caldav app, or through the web front end.
Android can use DavX to sync if you’re in to foss stuff
I pretty much only use it for tasks and a maintenance calendar, but I’ve had zero problems with it so far
Hang on though, if it’s web stats, how many of those impressions are ai bots scraping training data claiming to be Firefox users?
Don’t those likely read as Linux from how they fingerprint on TCP connections?