Initially, LinkedIn was just another site where you could find jobs. It was simple to use, simple to connect with others; it even had some friendly groups with meaningful discussions.
And then it gained monopoly as the "sole" professional network where you could actually land a job. If you are not on LinkedIn now, you are quite invisible in the job market. Recruiters are concentrated there, even if they have to pay extremely high prices for premium accounts. The site is horrible now: a social network in disguise, toxic and boring influencers, and a lot of noise and bloated interface to explore.
When Google decided to close their code.google.com, GitHub filled a void. It was a simple site powered by git (not by svn or CVS), and most of the major open-source projects migrated there. The interface was simple, and everything was perfect. And then something changed.
GitHub UI started to bloat, all kinds of "features" nobody asked for were implemented, and then the site became a SaaS. Now Microsoft hosts the bulk of open-source projects the world has to offer. GitHub has become a monopoly. If you don't keep your code there, chances are people won't notice your side projects. This bothers me.
Rant over. I hate internet monopolies.
GitHub is not a monopoly: it has competition. If you're upset about it's market share, switch to GitLab, Bitbucket, or host your own instance. If you're upset about people not being aware of the other options, be an advocate and spread awareness of the alternatives.
It's not a monopoly, but it's still an oversized influence on the market. I think the poster is arguing that: when have you heard a recruiter ask you for your bitbucket account? But they will look at github.
If they ask for a GitHub but you have a bitbucket send them the repo link to your bitbucket...
Yep, 'Github' is just a placeholder. If Bitbucket had the biggest market share (god forbid) the recruiter would ask for your bitbucket.
I've put my gitlab link in my resume and it has never had anyone spark a question. Usually the recruiter isn't concerned with it saying "github" so much as you try to answer it with something instead of a blank stare / left on read.