Where does this supposed saying come from? All I hear is PostgreSQL is the database intelligent people use, Git or GTFO and I don't even know what a closed source programming language is. Apache and nginx, Linux, DNS infrastructure.

In an agentic world, why do I want closed source software that my agent can't adjust and adapt to my needs for...anything?

To be clear, the saying is about how companies treat open source, not the intrinsic value of open source to end users (individuals or companies). I'm very much a fan. The point is that profit-seeking only push for open source when they're losing.