I moved off to Radicale years ago: https://radicale.org/ I use it with Thunderbird, and DavDroid (now DavX) to handle all my events and contacts (SMS contacts even show up correctly in Hangouts on Android phones) I realize GCal is rarely ever down, but they do harvest all your data to sell you shit. Here's a basic Dockerfile for Radicale if you want to try it out: https://github.com/sumdog/bee2/tree/master/dockerfile…
I work at google. I am pretty sure google calendar data is not used for ads targeting. The same is true for gmail.
[1] https://blog.google/products/gmail/g-suite-gains-traction-in...