[sureste]

The main dev for Vue, Evan You, funds development for it through Patreon[1]. Also, it has quite a few sponsors[2].

[1] https://www.patreon.com/evanyou [2] https://vuejs.org/#sponsors

[juandazapata]

Also a little company called Alibaba uses vue in production.

https://twitter.com/vuejs/status/669141763760766976