I'm sure there's companies in Europe that have on-call shifts, but I've had several jobs now and the only company that ever asked my team to do on-call outside

I'm sure there's companies in Europe that have on-call shifts, but I've had several jobs now and the only company that ever asked my team to do on-call outside of regular working hours was a US company and we had to explain to them how German labour laws work (specifically that you have to pay people for being on-call and that there are legally required rest periods).