They keep expanding in places where it doesn't snow.
They've got testing facilities in Detroit ( https://mcity.umich.edu/what-we-do/mcity-test-facility/ ) ... but I want to see it work while it is snowing or after it has snowed in the upper midwest.
https://youtu.be/YvcfpO1k1fc?si=hONzbMEv22jvTLFS - has suggestions that they're starting testing.
If AI driving only works in California, New Mexico, Arizona, and Texas... that's not terribly useful for the rest of the country.