Contributing to OSS is a hobby, not a job. You explicitly work for free on purpose. Whether or not you’re able to pay your bills is unrelated to the OSS contribution, it’s very clear that you’re not going to get paid for writing code that you’re giving away for free.
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
