BTW I think some anti-Rust people are more annoying than the worst Rust evangelists - seen some of them calling people not using Rust as "murderers", because "memory leakage can kill at the right time" - but that's due to them being evangelists to right-wing politics.
"Don't look a gift horse in the mouth"
No, you probably should look into that horse's mouth to make sure there are no Greeks hiding in it.
"Beware Greeks bearing gifts"
Again, no. You should be wary of gifts bearing Greeks.