While most of our emails bounced, we heard back from one of the site owners (who asked to remain anonymous), who confirmed his hosting provider took down the site after a complaint for copyright infringement by Apple.
This is a good thing. You’re not allowed to sell access to the beta, so they should be shutdown. Here’s the thing — these OS updates are betas and most people don’t realize the damage they can do to their phones if something goes wrong. As a developer, I have full access to the beta, but I still don’t have it on my phone.