Same. Brave on Linux, no VPN. I didn't at face value care too much, as I find the site cancerous, but it did make me realize how many times I click links into it.

I can't wait until a worthy successor appears.

Just a guess, but are you in the UK and is /r/osint flagged NSFW, harmful or mature?

If so, they want to age-verify you.

They ban VPNs unless you're logged in (and randomly shadowban users using them), and probably other datacenter IPs.