Because certain vendor from certain country have a huge patent portfolio on Autonomous vehicle (AV) and wanted it to rely on 5G so that everything is centralised and could easily be controlled in the name of traffic shaping (cough). And somehow (cough) EU was brought into the whole thing until a Saint appeared, after being banished to hell he finally came back and convinced enough people AV with 5G would need to total state surveillance. I think, if I remember correctly EU finally abandoned that idea. But as with everything it may come back someday. ( Hope not )