That is unrelated. Things licensed as open source can still be commercial products.
Ardour is open source and can be freely build and distributed, but it's also available as a pre-build product to pay for.
Ah I see, so that's what it looks like when you're not using a linux distro to obtain Ardour. And no, I never pressed the button because I just get it through Ubuntu Studio, and I've been using Ardour for years, for my simple (but frequent, multiple times per day) needs whatever version is in there is plenty.