That is not true. I have submitted plenty of links from new domains (side projects) to reddit.
The question wasn't about GitHub's specific reasons. The question was "war on hyperlinks" which is a much more general/broad question.
Reddit should probably take some steps to help users understand the difference between Mods and Admins. It's extremely common on reddit for users not to know the difference. They are always taking the heat for something some random user did to a subreddit they moderate.
― Oscar Wilde
https://www.goodreads.com/quotes/22688-everything-in-moderat...
Russia is obviously hated due to their war, but banning .ru is just dumb.
Why? Is it perfect, no. But perfect is the enemy of good. If it noticeably reduces posts and votes which Reddit's teams have to deal with, while also no having a material effect on the general user experience, then why not use geo-blocking?