Honestly, I do get it, but imho, this seems a bit crazy. I don’t remember normally using a dedicated boot partition these days… What was old is new again! I'm fine with this change as its not removing support for the file systems altogether, its simply saying those can't be the boot volume. Seems like a small price to pay to significantly reduce the attack surface. I'm also wondering if this decision was driven from histories of compromised machines. As in, did a data analyst show a chart that 90% of a specific breech comes from this group of file system vulnerabilities? If so, then removing boot support for them dramatically would reduce compromised machines.

TBH they probably shut it down because LLMs are spamming the bounty system. This is the reason. Its stated in the article: "Why did it come to this? Back in March, a post on the Bug Hunters blog from Google engineers said AI-generated reports were flooding the program. Some were serving up hallucinated information, while others were flagging legit coding errors that had little to no impact on the security posture of the targeted project."