IMO, CloudFlare meets this definition. For many DDoS victims, the problem would not exist without CloudFlare's help. Many cases like this are not some big bad guy with their own sizable botnet, they're just some kid using a booter bought with mommy's credit card. Without those booters being easily available, there would be no problem.

DDoS wouldn't go away without booters, but many small cases like this would be significantly reduced.