To me, it's a nuisance, given that the new flight leaves 40 minutes earlier, and normally, I would have missed it had I not looked at seats.
So I don't appreciate the lack of communication, and my car service company doesn't know yet if they can pick me up at that time.

I'm more interested in the "acceptance" terms. If they already rebooked you, what recourse do you have. Can they put you back on the original flight or how does that work?