Because I don't mind people using my software commercially if they are respecting the license. I wouldn't want to be charged for all my commercial usage of Linux, Git, Postgres, zsh, the rust toolchain, etc.

I believe if everyone in our industry tried to capture all/most of of the economic value of their work, we'd all be poorer for it, metaphorically and literally since a huge part of high SDE salaries is due to high productivity enabled by the open source ecosystem. We are all freeloaders, to varying degrees. Without FL/OSS, most of these source-available companies would never have gotten off the ground.