I’m on iOS 17.1.1 using Safari. I also have Proton VPN enabled in the states but if I try to visit any page on the website I see this:
If I disable it, the page will load.
Edit: as per a comment, this may not be a VPN only issue.
Additional edit: Reddit has written an official post stating it was an issue after production code deployment and was reverted
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If you encountered it without a VPN, it would appear to not be based purely on VPN usage - which at the very least is good news for the privacy oriented.
If they want to block any mildly odd user agents, it’s probably to prevent webscrapers so they can force AI companies to pay for their ridiculous API prices