I have Simple Calendar synced to Nexctclouds CalDav using DAVx5, syncs just fine.

Did you have an immobilizer on your car? Where I live the insurance basically requires one if you want to be insured, so virtually all private cars have one installed.

The original article on the TikTok video that has “started” the trend refers only to low end models without one installed, so starting it without a key becomes trivial.