Note that the more you know about them, the worse it gets. I wrote a report for Education International last year as part of a global campaign against Elsevier. https://www.ei-ie.org/en/detail/16061/elsevier-the-price-of-...
You make it sound so easy, but if it was, don't you think people will have done it already? Monopolies, vendor lock-in, lobbying, divide-and-conquer approaches, all make moving away to a better system quite difficult.
Public funding agencies should be prohibited from giving away funds and copyrights to private entities with 30%+ profit margins. I cannot understand why this is legal.