It's not about mooning, it's about getting scammed, paying 20K sats to use a relay and then a week later getting rugged. This potential exists. We as a community need to not just add every single paid relay that pops up. They need vetted. We need to build our Web-of-Trust.
Discussion
Yeah my point is that this is just how paying for stuff works. You don't always get what you pay for, and markets tend to sort these kinds of things out, especially when what's being sold is a commodity (relays are easily commoditized).
Reputation will build organically and risk of being scammed seems very low to me given the small price people will be willing to pay for spam filtering.