> feels reminiscent of blockading the strait because you don't want the strait blockaded

I think this is a poor analogy, unnecessarily politicizing the topic.

It might be a good analogy the other way around, if hackers DDOSed the website as revenge for partial IP-based blocking, in order to apply pressure to the website operator to remove IP-based blocking. But that wasn't the topic.

It's accurate. The USA is doing "Iran can't blockade the strait if I blockade the strait!" and Cloudflare is doing "Hackers can't take your site offline if I take your site offline!"