Yes, there will probably be only a few big world relays, just like there are only a few search engines. The difference is you can verify when relays are censoring which will incentivize them to be as neutral as possible, as long as there is one relay that is a good actor. It's actually very analogous to Bitcoin mining pools. Economics forces only a handful to exist, but as long as there is one transparent and fair option ( Ocean ), then the others can't collude as the switching cost is low due to the open nature of the protocol. It's the same with AppViews. This is all theoretical of course, time will tell.