They don't get everybody, but they do have stings. They catch people and post their names. I believe they even caught a Canadian M.P. (from Saskatchewan or Alberta).BINGO!!! Look at the situation in The U.S. were it is illegal for both Girl & client. In all major cities Incalls & OutCalls are thriving ..... and are advertising on BACKPAGE. Cops & communities worry more about other things than consenting adults involved in this Industry.... PERIOD!!
The risk of criminal prosecution is still real regardless of the extent of enforcement measures.
However, regulars of established indies will have less risk, but it's not like there won't be any risk.