The "30 arrests a day" or "12000 arrests a year" stat is wildly misleading. I've addressed it before here https://news.ycombinator.com/item?id=41488099
We're talking on the order of a few hundred arrests per year for section 127 of the Communications Act and 1500 per year for the Malicious Communications Act, which includes stuff like racial harassment, domestic abuse, pedophilic grooming, and a whole host of things that I would hope you agree should be illegal.