So large companies are more open to using it because it's less risk and has higher chance of being around in 5 years than a framework without a huge backer.
That's my theory on how 'biz' people make I.T. decisions.
They're solid, non-arbitrary reasons. Given a choice between the most common tech on the market and a niche offering, you need to have a good reason to choose the niche offering, because it comes with real downsides to a development team (as opposed to an individual developer).
I'm not a web developer at all by trade, but it took me only 1-2 days to pick up the essentials of Vue. That's not because I'm brilliant, it's because the barriers to entry really are that low. It's simple. They've nailed that part well, and it's a very seductive differentiator in a JS front-end world that just keeps getting more and more Byzantine.
Admittedly, I did have some Angular 1.x background, but it was really just dabbling in the grand scheme of things. And I gather that a React background is equally advantageous in picking up Vue.
More generally, given the insane ADHD pace at which front-end web technology moves, I'm not sure hiring developers for any particular framework experience is viable. People sometimes say that about tech hiring in general, and I don't necessarily agree, but web front-end work is really the one area where I think it holds true and you just have to hire competent JS developers experienced with a variety of tools and frameworks in general. There's just no telling how different the landscape will be in 1-2 years.
What is not is the next step when these groups become extremely invested and endlessly hype their choice and rubbish others in places like here never mind any technical merits or demerits. The prevents proper technical scrutiny of hyped technologies and allows a lot of bad ideas to gain traction.