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.
Show me where to pay for the pre-built product:
https://community.ardour.org/download?platform=linux&archite...
All I see is a direct download link. If you want to pay that's optional.