When you use a captcha, you presumably want to defeat someone curling your CreatePost endpoint, not just make it more annoying to do it at only botnet scale.
This captcha still lets all traffic through. Except now you waste the battery of honest users.
Even HN proponents of the idea don't use it on their own sites.
I rather see something like anubis than some unsolveable captcha. I never understood the battery-argument, I recon my screen uses more energy during pow-solving than it takes my phone to solve these pows.
