I’ve offered (and still do) free massage on Grindr, etc. some very innocent mention in my profile, but in private chatting I mention it early. similar stories as yours, maybe not quite as much quality success as you. But a couple of great ones! Most are surprised how good my basic massage is, before I get it to the fun parts.
I’m always (pleasantly) amused how many of these guys start moaning when I’m working their thighs/glutes/butts....lots of them don’t seem inclined to bottom when they arrive, but later into massage seem to indicate they do!