TLDR to earn (tax free?) money, it has nothing to do with hospitality
Let's go the US way and arrest children for doing lemonade stands. How dare they not get a license and pay their taxes to Uncle Sam! /s
There are probably millions of child lemonade stands in the US. I think you must be referring to a story where one family was asked to take down theirs for some reason.
The reason that story was written and is memorable is because it's so whacky and unusual. I expect my kids to run lemonade stands with no complications:)