He doesn't spoil the entire community.
Spoilers are posted in specific threads, here and in the Pirate King Forums. He doesn't even mention spoilers in Twitter. And, there's more: I am sure he has nothing to do with people who spread spoilers thoughout the internet.
I know a lot of people who just read the official chapter or the TCB. I understand those who doesn't like spoilers. But, ethically, Redon isn't wrong. His spoilers are posted, as I said, here (IN THE SPOILER SECTION), and same for the Pirate King Forums. Nothing wrong.