I find it amusing that the author mentions Git and Excel in the same breath. One is a GPLv2 piece of software that you can submit patches to, fork, or build you

I find it amusing that the author mentions Git and Excel in the same breath. One is a GPLv2 piece of software that you can submit patches to, fork, or build your own copy and sell it (so long as you release the source); while the other is a closed-source piece of software that provides largely static utility to many people, yet keeps increasing in price (latest is ~$100/year for an "Office 365" subscription if I remember correctly). Imagine if you had to pay $100/year to use Git. I would probably hand it over, begrudgingly. But the fact that I don't is probably one of the more important triumphs of Free Software over proprietary in recent years.