It’s not an anti-playtesting rule-- just want to be clear on that. If someone wants to talk about their game, do a design diary, and maybe point people to another site where you’re signing up folks for interest or future playtests, that’s cool.
What we ask is that folks not organize game sessions on the forums. There’s a couple of reasons for that. The most important to me is that we organize games via The Gauntlet Calendar. We have a firebase site which supports that, we have a code of conduct which applies to those games, we have a strong play culture, and we require GMs to use and explain safety tools. So we want any games posted/offered in our space to live up to that. That’s why we ask folks to play with us a couple of times before GMing and we offer support and events to help folks get used to running online (or just running).
That’s always been a mainstay for The Gauntlet, a complement to the podcasts. The forums arose because of the closure of G+, and we wanted to offer a decent public game discussion space.
The Hearts of Wulin topic you mention wasn’t about organizing events, but rather gathering feedback and pointing people to things.
Again, if you have a game-- feel free to talk about it. Direct people to resources, point folks to playtest materials, link to your site. That’s cool. What the moderators have kept off the forums has been direct recruitment for play groups and setting up specific events. There’s lots of great dedicated places to do that-- I know lots of people use the Roll20 game tools to get players and the RPGGeek forums also have a section dedicated to finding players and setting up games.