I guess you guys have added some anti-adblocker thing or whatever which is fine. However I have allowed D&D Beyond through my adblocker I have running and are allowing all cookies for that domain, yet I'm still getting prompted to prove I'm human every time I go to the site.

Clear your cookies and browser history, and turn off all ad/popup blockers, browser extensions, and VPN as they may be causing the issue. Once you have cleared the issue you can turn those back on again 1-by-1 and try to determine which one is causing the problem.

I have been inexplicably experiencing a similar problem, did this ever clear up for you? Were you using a mobile device?