They could easily do that by:
- Threatening to site-wide ban moderators who keep their subreddits dark (on the basis that they’re disrupting the regular function of the website.)
- Actually banning them if they follow through on another blackout.
- Doing a bit of overtime to moderate /r/redditrequest, on the condition that people don’t request subs that already have more than two million subscribers.
I don’t think it’s wrong for Spez to charge for API access, but the rates he’s vowing to charge are excessive and clearly designed to nuke third-party apps from their ecosystem.
As for how I’d make money from Reddit in his shoes, I’d: