You'd have every first year college student trying to get their name on the mailing list with some crappy commit that adds no value and only takes time away from meaningful work.
Then you've got to hand hold and coddle that person, because you have to be nice to everyone. Yeah that's not gonna scale very well.
I can see going easy on independent developers. But this is Google. One of the biggest licensors of Linux and a closed source competitor. Here they are adding a feature to a repo they need to use, and they're doing it half-assed.
This is a feedback loop. Don't submit shit code to the most important repo in the world. Ain't nobody got time for that. If you do it as a fortune 500 company we will publically shame you.
Some of y'all have never been earnestly told to get your shit together and it shows.