Because it makes them money and for some reason people (and governments) have accepted their lie that they can't police this. Comparison to the olden days; if a paper magazine knowingly allowed scammers to advertise they 110% would've been prosecuted. It is really weird that we let google (and others suchs as meta!) get away with this.

Some comments make it seem like this is a new thing, it's not, this has been going on for at least 10 years now.