That link is broken.

They've deleted it, been working for years that link. Someone there is reading this post.

It was working for me within an hour or so of you posting it here today.

I didn't claim anything from it, but if there started to be a diversity of accounts suddenly registering the keys it wouldn't surprise me if it raises flags somehow.

The keys are just keys, claimed on Origin/Steam etc so not sure what system they'd have in place for checking that.

Could be lots of different IPs loading the page but I still don't see why they'd worry about that.