Previously noted in Coed Discussions
https://eccie.net/showthread.php?t=2952724
“We don’t think we are going to use just enforcement to stop this problem, so we are going on the civil route in addition to continuing our enforcement efforts,” said Chief Drain.
Yeah, Plano has a large number of massage spots (indicative of demand?). I'd opine that the large majority offer L1. Also opinion, but I don't think those attract that much attention from Plano LE, rather those that offer higher levels tend to get the attention.
That said, civil actions (lawsuits) may well be more effective than enforcement. It may also be more costly for the city/cities than enforcement.