So what you're saying is that the framework that's got the least active ecosystem, least amount of devs that use it and that you can hire, least amount of resources is the best for startups - companies that need to grow, find employees, onboard them and teach them the tooling; and the best choice is the least supported one?

I'm not trying to offend you, but if you teach people all 3 frameworks and you tell startups to use the least supported one - can you see why that might horrible? Honestly, I'm skeptical about your ability about any of the 3 frameworks, you teaching them to people doesn't attest to your ability at all. Suggesting to use the least supported one - does.

I despise React, I suggest React to all the newcomers. Reason: larger market. They'll get a job quicker. They'll find resources to learn it at any corner.