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> This website is using a security service to protect itself from online attacks.

Oh, boy. This early? The link is on HN for less than an hour and the site already panicked.

Or it was already using Cloudflare

That message usually appears on cloudflare sites using Hcaptcha

This time it’s not the “fill out a CAPTCHA to gain access” thing, but rather the more aggressive “no, you just flat-out can’t access this site” form.

Yes. It is enabled by the website owner. I can that on many russian sites that ban all non-russian IP's.