They're aiming at making it near effortless to migrate off GitHub, and 99% of all GitHub users are using Actions... so there's that.

But yes, they also should work on making it super easy to integrate best of breed OSS CI/CD with their SCM and turn Actions off. If they manage that they are on their way making a product which blows GitHub and Gitlab right out of the water. Because while Gitlab allows to integrate third party CI/CD it really feels clunky. (at least at the time I've used it professionally)