The on-call rotation had escalation, and instead of going to the manager it went to someone else in the team. Since there were only two backend engineers in my team, I was either always 1st or 2nd (clown emoji).
Unfortunately this is a huge hole in German labour law.
I quit there pretty fast, after a couple months. It was a tourism company, so Corona treated them very well.
The other company where this happened was a Content Marketing company that was wiped out by ChatGPT. I didn't do on-call there but the other team did.
What kind of slave driver expects literal 24/7/365 availability? Does that not breach labour laws where you work?