It’s actually off putting if you check out a potential employer’s GitHub and it’s filled with obsessive committers, obviously working late hours, weekends, holidays, etc.
Or just pretending to work, as is more often the case if there's no empty days.
Even worse: I've seen profiles that run scripts to generate fake commits for the sole purpose of making their GitHub stats look like they're working. Absolutely asinine, and a huge red flag when hiring.