The issue with this strategy is…
The issue with this strategy is that for the vast majority of new users, paid relays are an extra barrier and cause inertia, and therefore, limits or reverses growth. Compare this with the bluesky growth hack where they had big servers that could handle up to a million users from the get-go. The result was that Bluesky went from smaller than nostr, to over 10x bigger. Advocating for paid relays is a poor strategy, because only a few will get paid, and not enough to keep the lights on. That will lead to fewer users, and less revenue. That would act as a further centralizing force in nostr.