It's an interesting approach to spam. It's kind of like the way people dealt with the tobacco industry in the 90's (and maybe still now? I haven't kept up) by just suing them for damages, false advertising, misleading stuff, or whatever else.

I think that this is one of those less heard of positives of having a litigious society. Sometimes we can curb nasty behavior by making rules that allow people to sue violators into submission.