A bit off-topic, but as somebody living in Europe, I found it interesting to discover from the comments here that lawn mower robots are not popular in the US. S

A bit off-topic, but as somebody living in Europe, I found it interesting to discover from the comments here that lawn mower robots are not popular in the US. Some of the readers don't even seem to know they exist. What is the reason for this? I know that estates are bigger in the US than in Europe on average, but there must be still millions of families with lawns smaller than 10,000 sqft? (which is the maximum lawn size for most robots below $1500) (Of course, there could be some bias here; many HN readers probably live in big cities)