I don't even use a VPN. It still allows me to view subreddits and my own account, but this happens when I try to enter a comment section. Fuck reddit, I hardly ever post there these days, but damn it I do need access to the information in their comments sections pretty often for a variety of reasons.
What's more, it's only happening on Firefox. I downloaded and installed chrome and everything is normal on that browser.
Edit: Clearing cookies fixed it. Leave it to reddit to give you a page that's like "lol fuck you we banned you piss off" whenever their site has a bug and shits the bed
Is it still happening? It was happening to me too for most of the past half hour, but only when logged in and only when using a normal browser window rather than private. Now it's stopped doing it.