I work for a startup with ~60 employees. The DNS was setup through GoDaddy by our CEO over 6 years ago when the company consisted of just founders.
Employee #1 updated GoDaddy to point to AWS for nameservers. We've been managing DNS through Route53 ever since. It's tech debt, sure, but migrating domain ownership to AWS gives us almost no benefits. I guess having more consolidated billing would be nice, but until finance complains at me I'm not bothering to change it.
It would pain me to find out that a candidate would red flag the company based on domain registrar. Then again, I don't know if I'd care to interview someone who makes such large decisions based on small details with no context.