I am sitting in an office of 500+ Windows machines compared to 2 FreeBSD (and no Linux) machines.
I have to use Outlook otherwise I can't book meetings.
I must use Slack otherwise I can't communicate with my colleagues. (Or, alternatively, Skype For Business, but same issue)
"Free Software" is _not_ winning anywhere that isn't servers. (and they have fierce competition there too).
You've just proved his point more than you ever wanted.
> checking email
On the (probably) proprietary Mail or Gmail app.
> waiting in line
On the (probably) proprietary app for whichever thing you're staying in line for.
> playing Angry Birds
...
> making a photograph
...
> or checking up on Facebook
...!
Who care if the kernel, heavily modified and buried 100 layers deep is Open Source if all the apps users actually use are proprietary?
I guess by this definition any open sourced library that an "end user app" uses doesn't count either.
FOSS has barely "won" the lower levels of the stack and the highly technical niches. But the more you move towards user-facing applications, the more proprietary things become.
In a world, where almost all software was proprietary, and open source only made sense if you're living in towers of academia - RMS made sense and contributed greatly to society. Nowadays - not so much.
It isn't worth it to restrict freedom of creator and force him to write open source software for minimal increase in the freedom of the users, when there is already an open source alternative for the given task.