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Slate, a customizable EV pickup for $20k
(electrek.co)
This is a most excellent place for technology news and articles.
I'm from the states, but what's stopping one from removing the modem or snipping the antenna?
Possibly, technical inspections. I'm not sure whether it's a requirement for cars to be street legal or just a requirement for cars to be sold on the market. The regulation only mentions that it's about type approval but it's not like modifying a car automatically nullifies its type approval.
Certainly would be hard to argue for authorities that snipping the eCall would endanger others, similar situation as with seat belts I don't think legislation is unified there.
Why would you?
They sell emergency car lights that you pop up on top of the car ala secret police (but yellow). They have a modem that when activated automatically notifies the road services of you being there stopped.