Don't remove public relays or you will be isolated, not every one can broadcast to this paid relays.

I’ve only used nostr.wine relays (with most importantly filter.nostr.wine) for ~2 years. I don’t read directly from any free relays. For our aggregator behind Filter, we use a data pipeline we call “Purgatory” to strike a balance between coverage and new pubkey spam. There are tradeoffs but I’m quite pleased with the results we’ve seen thus far.