I read the Github page and I see they promote this trash as optional, but to be implemented both by relays and clients.

I've said this so many times it's not funny anymore -- the moment these morons start to fuck with relay-level editorializing, that's when they open the door to being targeted and eventually prosecuted for the content they host, and that's how Nostr dies in the long term.

I guess they just can't help themselves, and rather poison the network instead of getting their fee-fees hurt by words on occasion.