I mean it’s fine, use whatever your comfortable with and Bluesky is the next frontier for development ideas.
EDIT: Ask five people you know outside of tech if they have a Github account. Everyone I know outside of tech moved to Bluesky from Twitter. No one I know outside of tech has a Github account. If I encounter someone who has neither, I'm of course going to recommend a Bluesky account from a utility perspective, as they're likely never going to contribute code, issues, discussion on GH if not a tech person. (most of my network is non tech, non startup, non SV people, ymmv; HN is the closest I get to tech folks most of the time)