I set up a session with a provider in PDX a few years ago. Everything was going well until he had a minor meltdown about the fee arrangement we’d agreed on. He demanded more out of the blue and I demurred. Then he initiated a flurry of texts and phone calls. I thought, “this guy is a bit unstable” and blocked him. He stated that he would blacklist me with other providers in PDX. I doubt it worked, since I had a hot time with another one that same weekend (I was visiting). Not sure who he warned about me!