If scientific research had started in this century, I am pretty sure no researcher would have ever thought of publishing research papers in a centralized journal where the journal gets to make so much money for a contribution that is not commensurate. Instead, they would have chosen an online platform that is funded and managed by the universities and research centers participating in this platform.
What you are saying is equivalent to stating a tautology: Elsevier is still important for researchers' careers because Elsevier is still important for researchers' careers.
The deeper question I ask is: Why is Elsevier or such centralized journals still important for researchers' careers?
Why can't the academia move to a model where only the impact of the paper matter where the impact is measured by some open source metrics like citations, number of stars, etc. I am not suggesting these exact same metrics. These are only examples. But it should be possible. For example, in the software world, GNU, Linux, Node.js, Git, etc. did not become important by publishing in a centralized journal but by publishing on open repositories, some amount of marketing, and by the virtue of being very useful. What prevents existing researchers from moving to such a model? If enough influential people move to this model, Elsevier and others automatically become unimportant.