Early on here — and many times since, intentionally relegating images (both attached & embedded) AND file downloads… were restricted to registered and logged-in members. This was partially to incentivize lurkers and the occasional, hit-and-run download visitor to register with the Forum. Maybe best to ask Knezzen or DieHard directly about this?
Ya gotta register almost everywhere else, dontcha?
68kMLA and MacRumors / PowerPC Macs, both will allow you to view small images without logging in — BUT in order to view larger, more detailed versions of those smaller image files, well… ya gotta log in. [Does System 7 Today offer the ability to attach, view or embed images?]
I think that TinkerDifferent.com doesn’t require login - but I could be mistaken.
Have never used RSS to access content here. Do you get the header info using the RSS approach? Because, when accessing the Forum via most browsers, you’ll see this little “paper clip” icon alongside the post’s title… signifying attachments (files, images, etc.).

I visit MacOS9Lives at least once, if not more than 4 to 5 times a day via FireFox browser and I read daily, nearly all new posts. Yet I may never actually log in… unless there’s an image I’m interested in or whatever the post might actually cover.