You're forgetting the people and companies that bought domains back in the early 2000s who now have dozens or hundreds of domains on GoDaddy. People stay becaus

You're forgetting the people and companies that bought domains back in the early 2000s who now have dozens or hundreds of domains on GoDaddy. People stay because it's easier than transferring. A lot of people still use them even for new domains because they're still the cheapest game in town.