Valid points, and for sure it won't be an easy task. But there are other projects like those from by Wikipedia, Mozilla, Linux Foundation, Apache Software Found

Valid points, and for sure it won't be an easy task. But there are other projects like those from by Wikipedia, Mozilla, Linux Foundation, Apache Software Foundation that managed to attract developers, companies and donations. If lots of companies would contribute money, it would be cheaper for them to use an open model than being milked by some vendor. And what's even more important, they would be able to customise it to fit their business needs and use cases much better.