Introducing a Captcha on a form on my website basically blocked bots 100% of the time. It’s arguably good enough from a practical standpoint.
If someone really wants to exploit my site, then they will find a way. You can only make it harder but never truly impossible if you don’t want to dispose of all convenience.
While he advocates for it, that’s also a point that Martin brings up multiple times when he talks about his project “fitnesse”.
Basically saying that they left it open how stuff can be saved, but the need has never arisen to actually pivot to a different system.