"[...] , nobody goes after the small fry."
It seems that quite often the law enforcement agencies do target the "small fry". They count equally well for the purposes of statistics. They are usually easier to "catch" - or at least are cooperative when made aware they have technically broken a law.
Big criminal operations generate big money. Big money buys accountants and lawyers to make the prosecution's path as rocky as possible.
It seems risible that the same effort is not being put into the scandal of the cold-calling companies who apparently make big money and then fold like a phoenix to avoid paying fines.