BetaArchive: During my retro computing phase, I used to go there to participate in interesting conversations for Windows features as well as beta builds of Windows. When they started purging content from their FTP server as well as remove interesting forums posts that I've tried to look for, only to find out they were deleted, I lost interest in that site to the point where I've pretty much stopped visiting it.
VOGONS: Another site I joined during my retro computing phase. I rarely visit the site nowadays due to my interest in the hobby declining over the past few years as well as some of the toxic comments that I ran into during the times I visited there.
DVDizzy: It seemed like an interesting forum for discussing movies and TV shows (especially from Disney) on physical media when I first discovered the site, so I've tried to register an account there, but I was never able to get my account activated for some reason, so I just gave up and decided not to visit that site anymore.