So you would be safe from arrest for a few days.  After that it would be open season on hookers and johns...

Gay guys have "Grinder.app" for their smart-phones which expedites anonymous hook-ups by finding other like-minded gay guys in the vicinity.

WHAT IF there was an App like that which would allow ladies & gents of "THE Hobby" to find and contact each other on the spur of the moment.  Say, I'm in Chicago's Gold Coast, I turn on my "Hobby.app" and the gps finds other registered members in my vicinity.  Click the icon, opens the ad or website, hit dial call, and it's
"How YOU doin'?!"

I am consider making the App, if there's a market for it.

Why would anyone book a session with an anonymous hooker?  Why would she do it either? How would you do your homework?

All you are changing is the initial point of contact. Presumably, everything else remains the same. You can still check her reviews. She can still request references from you. Etc. The primary benefit is finding ladies who are closeby (say, within a 5-mile radius) and available at that time (i.e., logged in). I would use it.

As for LE, I don't see how that risk is any greater from an app than it is from a web site. Either way, they have the same information to target you, if they ever feel like bothering with it.

How would an app like this get approved? gay hook ups are legal
hooking up johns and escorts is illegal...