New users don't know but early adopters who advocated to spread the ecosystem and tooling surely chose git because it was used for the kernel and guessed that it would work for everyone.
New users never had any choice these days as their workplace is already using git.
The workflow is faster for new users to learn, less concepts to grok, good GUI support, that's about it
> and for those people who are barely programmers are also required to use git to commit their HTML/CSS stuff but once something doesn't work
You would find that it's difficult to get non programmers to use hg even with a GUI, unless you have some very open minded people
> I know that people just simply jumped on it because of Linux/Linus name without thinking
Not true, so many git users have no idea who made this tool and don't actually care, all they care is that it's open source and suits most of their tasks