Huh. Apache, nginx, php, js, python, Linux, chromium, asterisk, openvpn... list is very very long. Actually I doubt there is more proprietary software that is widely accepted and reliable, than open-source (or even free) software with same achievements.
You want to say these products are not valuable or not maintaned by professionals? They are making money around their projects same as RethinkDB did, so I don't understand what difference you want to underline.