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.
Codeberg can automatically migrate code and issues from Github using a personal access token iirc.
Github packages and especially CI/CD are the real vendor locking antifeatures. All of the actions and scripts that your app/company depends on to run are completely locked to github.
Fwiw, gitea has compatible actions. Not sure how compatible, though.
I can run GitHub workflows directly on my machine with ACT, I'm sure you could run that on your own private CI if you needed too. It's not perfect, but if a lot of people started wanting to migrate I'm sure it could get better.
Doesn't Codeberg say it's mostly for FOSS? They say private repos are only allowed for really small things like note keeping, so it wouldn't be right to just move everything there from GitHub.