>And as far as social media websites go, Github is surely one of the most ethical of them all.

Is censoring stuff on behalf of Russian government ethical? [1]

>Github popularized git in a time when svn and cvs were the standards. Don't forget about those sad, sad times! We are in such a better place now!

Is that a good thing? We could've had a better VCS like darcs!

>They also recognized the power of git to completely lower the bar for participating in open source projects.

Thus lowering the bar of open-source projects.

>"Pull requests"? "Forks"? That stuff didn't exist in the mainstream developer imagination.

Forks have certainly existed since open-source model existed. Pull request is an anti-pattern anyway.

[1] https://techcrunch.com/2014/12/05/to-get-off-russias-blackli...