After snowfall, but also after a cleanup by snowplows. What about when there's a thin layer of white snow everywhere?

What's your actual point, though? Is it that they won't try to solve the case where there's some snow on the road, or is it that this case is somehow not possible?

My actual point is that Yandex hasn't yet shown an attempt to solve that case (unless there are other videos), and therefore we can't gauge if they are even ready to attempt it.

Suppose they haven't started working on it yet. What's to prevent them from starting next year and having a solution ready in a few years?

The same that might prevent any team. If I knew what it was, I'd be more wealthy than I am.

They are surely more motivated in this regard than a Californian company.