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I don't think rq will be doing that. I'll do what I can to make sure he's able to afford his hosting without requiring subscriptions from visitors. That'd be a heavy hit against Danbooru.
Well, RQ has disabled new registrations and made access to Danbooru members-only at the same time in the past. I wouldn't be surprised if he could do something similar again, especially if he just wanted to temporarily reduce web traffic.