Production is about using the best tool for the job
I find this attitude kinda simplistic and problematic. This attitude applied elsewhere can be used as justification for all sorts of terrible things, I don't know why it should get a pass in tech. Sometimes the best tool for the job is produced by an evil company you want to boycott. Sometimes the best tool causes lots of collateral damage or harm, or has potential to lock you into an ecosystem. Maybe you want to support the growth of other tools and are willing to sacrifice some performance.
Even if only profit is considered, I think it's reasonable for a company to conclude that open source software is inherently better due to reasons that go beyond immediate utility and profit making potential by thinking longer term.