I'd say the police don't want to have to deal with this. Pressure put on their higher ups by Sky, BT etc. to scare IPTV subscribers.
Sky's model worked well for a long time but as Internet became fast enough to the point of live streaming, Sky fell behind the times. Also the 3pm Saturday ban and the average domestic customer has to pay through the nose yor a package that doesn't include every match. I think the Premier league will have to reevaluate its TV rights deal and move to a competitive pay as you stream provider/platform as the old model cannot compete with IPTV.