Opt in block lists? Some could be community managed, others could be managed by clients, or other service providers.
That sounds reasonable to me.
Relay side forced censorship is not reasonable.
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Relays are opt in though, so some may choose to block spam as an actual selling point for their service (this is already happening). I don't see that as forced censorship.
You could also have an appeal process for relays, which could charge an invoice to prevent spamming appeals.