The idea of Github having a unique "taste" advantage resonates with me a lot. I don't like the fact that Github is using my code to feed Microsoft's AI ambitions, but I dislike Bitbucket and Gitlab more simply on the grounds that they "don't look fun".
It's tricky, because any serious Github competitor would implicitly have to compete by attracting the deep pockets of enterprise clients, who care little for "fun". Getting revenue from solo devs / small teams is an uphill battle, especially if you feel obliged to make your platform open source.
Still, I wish someone would make a Github competitor that's fun and social.