It is very, very hard for any company to carry a platform on its own. The more other companies contribute to that platform, by writing software that works on or with the platform, the more that weight is lifted off the creator's shoulders and shared by others.
We rely on libraries and frameworks to accelerate our productivity. The more popular those libraries and frameworks are, the richer the ecosystem surrounding them. Community resources like Stack Overflow questions, pre-existing components, being able to google an error message, etc. all enhance a developer's productivity.
At present, React appears to be seeing far more active usage than Vue.js, but React has been around longer. React also has far more active contributors, and has consistently been getting more commits.
Will Vue eventually catch up or supplant React? Time will tell, but I tried to look at the current trends.
