The question is why they haven't used stablecoins in this way until now. It's very easy to prepare the infrastructure. Legal procedures shouldn't be difficult to handle either. There is no obstacle to do this, but these companies cannot keep up with the speed of technology. It makes life easier for them to get paid with stablecoins, but it has no effect on Bitcoin. It would be nice if they accepted Bitcoin. By the way, Uber doesn't even exist in my country, the government banned them because of the taxi lobby. It's very strange that there are such differences in the world according to the region you live in.
Even if stable coins has not been one of those volatile digital assets, we should know that it is pegged around the cryptography which could still have effects on firms accepting it for payments regarded that it is also effective in regulatory societies. So may not be so easy just bumping in when drastic measures has not been put to place.
Atleast on this peak they would advance on accepting other volatile assets like bitcoin. For a start probably due to uncertainty, accepting stable coins on their table could alternate them diversifying in the future.