I sometimes use github search to double-check if someone has worked on a problem before startin myself. Even when the repo is abandonned, it sometimes gives a good starting point. GitHub often tells me about repos I didn't find on search engines.
I'd say go for it, but the discoverability aspect is important.
I also follow friends and sometimes find interesting projects through their stars.
This is, increasingly, one of the only things I find myself locked into GitHub for: if I'm working in a space that's sufficiently "old" (e.g, macOS APIs), I generally cannot get Google to produce anything useful anymore and end up having to comb through various GitHub repositories. It's maddening.
No other code search engine comes close anymore, unfortunately.
I'd say go for it, but the discoverability aspect is important. I also follow friends and sometimes find interesting projects through their stars.