Many cases including murder are simply locked in a drawer, or the victim is blamed because of his lifestyle he "had it coming", etc.
I think it's called the CSI effect when folks assume everything will be analyzed and investigated.
In this day and age if there's a phone involved there's a trace of text messages, location, etc. Unfortunately, cops don't have the time/manpower to investigate in all cases.
If he doesn't openly advertise on RM I guess he's not an escort and makes a living doing porno.
You can always send him a discreet message in only fans or Instagram and see if he replies.