I suspect we're very different.
I'm younger, but not new to programming (started in the early 2000s.) Mentality-wise, I like working on software because I like solving problems, but I only really do a day job to make a living, not to scratch an itch, so I continue to work on software outside of work hours. I basically don't care what happens once my software reaches the Internet. I publish some open source software, but not as a portfolio; just for the sake of anyone who might find it useful. I don't really advertise my projects, certainly don't go out of my way to do so.
I basically have GitHub for roughly two reasons:
- I use a wide variety of open source software. I like to fix my own problems and report issues. Some projects require GitHub for this.
- May as well take advantage of the free storage and compute, since everyone else is.
Honestly, my GitHub is probably a pretty bad portfolio. It is not a curation of my best works, and I disabled as much of the "social" features as possible. It's just code that I write, which people may take or leave.
Earlier in my career maybe I cared more, but I honestly think it's because I thought you were supposed to care.
I have worked with some stellar programmers from many different places, probably more than I really deserved to. I don't know for sure if any of them didn't have GitHub accounts, but some of them definitely did have GitHub accounts, barren as they may have been.