The key difference is that those professions don't "scale", and the output is linear to the labor (hours) put in. The wealth doesn't lend itself to concentrate

The key difference is that those professions don't "scale", and the output is linear to the labor (hours) put in. The wealth doesn't lend itself to concentrate into a few hands, and the professional worker is mostly independent and in control of what they do themselves. In tech, people work in teams where each person is a tiny cog in a (relatively) big machine. We still don't agree how to objectively quantify a person's work output. (Eg: do 10x programmers exist?) When a product becomes successful, there's no objective way to distribute the windfall, so the default capitalist rule applies (whoever invested money and/or has access to the best lawyers gets most of it).