For most people, [open source] is a hobby. It might be a hobby that people would love to be paid for, but then golfers or skiers would probably say the same too
Just keep comparing projects which form of basis of billion dollar codebases to people doing bougie sports. That’ll make your point for sure
a lot of the big open source projects these days are either run directly by some megacorp or are heavily funded by them. There are on the other hand thousands or millions of smaller projects that are utilities or incidental dependencies that dont get anything though.