I'll go first: r/kitty. One of the hundred grillion cat subs back on Reddit, the culture in this one was you posted a cat picture, and the only word allowed in the title or in any comments or replies was "Kitty."
Someone is using that subreddit for covert communications, I just know it. Either on the level of "if u/PM_me_your_nostrils posts an orange cat, we attack at dawn!" or there's some steganography going on with the pictures, but that subreddit was too stupid to be as active as it was.
facts: a couple of weeks ago the commander rules committee, the independent group that governs the popular Commander format, started receiving death threats after they banned some boring ass broken cards (jeweled lotus? dockside extortionist? nobody is ride or die for those)
as a result, the rules committee turned over control of the format to Wizards of the Coast / Hasbro, the makers of magic the gathering
fact: last year after some magic the gathering content was leaked, Hasbro send literal pinkertons to harasss the youtuber leaking it and recover the leaked goods
conspiracy theory: hasbro hired the pinkertons to make those death threats against the rules committee so that hasbro could seize control ove the most popular independent format of magic
I wanna say "nub uh" but the fact that they're getting death threats is really crazy. Like they changed the mulligan rule from partial Paris to the new one (Vancouver?) and basically everyone said "that's neat" and did partial Paris anyway. And over busted things like dockside? Goddamn there was barely an outcry over prophet of kruphix.
Sol ring ban I could see death threats. That's about it.