As an alternative, how many people in the UK own chains for their cars? If they did, it would mean they can drive down all those ungritted roads, but how many people think this is a worthwhile investment?
What happens when they reach the cleared roads?
Sorry, but your statement seems to neglect that one should only use chains on roads with snow on them or the chains damage the road surface.
And comparing a decision made by private individuals, to a ‘cost of doing business’ decision made by corporates is not really very realistic.