Atuin's CLI for shell history is open source, has been free for years, and is a very useful tool. If the author now wants to build a product on top so she can make a living, that's a win for everyone: the author, the open source users (since the project will keep being maintained), and people who get value out of the new product she's building.
The irony of this purist mindset is that it's actually very corporatist, big-tech, and proprietary in its implications. If open source devs are discouraged by the culture from building products and making a living independently, it means that the only people who can devote significant time to open source are employees of established companies (who themselves often sell closed source proprietary products) and people who are wealthy enough to work for free. Is that the world you want?
The irony of this purist mindset is that it's actually very corporatist, big-tech, and proprietary in its implications. If open source devs are discouraged by the culture from building products and making a living independently, it means that the only people who can devote significant time to open source are employees of established companies (who themselves often sell closed source proprietary products) and people who are wealthy enough to work for free. Is that the world you want?