Comment by perdomon
this is a solid argument against the open-source purists that I've never heard before and really appreciate. Many people would like to make money on the things they spend their time building. Some percentage of those people also love FOSS. Fair source is the middle ground where they can share their work, open it up for criticism, issues, and fixes, but ensure that their business is secure. It's a solid middle ground that shouldn't be demonized just because it isn't open source.
I think because providing commercial support for such a software is not allowed by the license, there is a strong vendor lock-in. That‘s a big drawback for users.