I don't understand how "appalled" being strong language is so controversial, maybe everyone here is just a rude little shit.

I would have worded it like so:

Hi, I'm concerned about the BLOBs used in this repo as they are a security risk, making the code less auditable. It looks like we could generate these BLOBs in a github action or something so we can keep the fast build process while making it easier to audit the code. I'm not exactly sure how to go about this myself but I've done similar things in other projects, maybe you could point me in the right direction as I am unfamiliar with the ventoy build process? Thanks for the really cool project, and hopefully we can sort this out easily. Looking forward to your response.

I did it with less anger and entitlement and in less words