An example of one person being employed and contributing to open source as part of his job is not a refutation of the statement. You don’t have to read anything

An example of one person being employed and contributing to open source as part of his job is not a refutation of the statement. You don’t have to read anything to know that, just use logic. To provide a counter-example you’d need to reference an open-source project that makes money selling the source code which, hopefully obviously, doesn’t exist, by definition