One common complaint we hear from Nostr haters is that there is no economic incentive to run relays or that the network will be centralized in a few central big relays. These claims often come from confusion or misunderstandings.
I think this 40s video will clear all the matters and answer all the criticisms: https://cdn.satellite.earth/8e48f90f4889d6d8def300e9d843b9b353375426212f6b6253a8ee6aaaefcf07.mp4
If anyone doesn't understand or has a problem with this answer, please, I would like to hear it.