> (underlined) Today it's a prostitution ring, tomorrow it could be an illegal gambling ring, and maybe next week it could be a drug operation. This is textbook 'slippery slope' fallacy. https://yourlogicalfallacyis.com/slippery-slope You said that if we allow A to happen, then Z will eventually happen too, therefore A should not happen.
Slippery slope is not a logical fallacy. Like any argument, it might be right or it might be wrong, and if your entire argument is, "X and Y are in some way vaguely similar, so if we allow X, then Y," then your point is certainly under-argued. But it is, in fact, the case that in at least some circumstances, people change the status quo by taking a small step outside the status quo, normalizing it as the new status q…
A small group of users act rational and in self-interest (by offering prostitution, illegal gambling etc.) and therefore make it worse for the other 'legitimate' users. In the long run, the 'illegal' users destroy AirBnB (by causing stricter laws etc.) and therefore destroy their own business.