I fail to understand why some programmers don't like to see other programmers get paid directly for their efforts. If open source work is not paid for directly

I fail to understand why some programmers don't like to see other programmers get paid directly for their efforts. If open source work is not paid for directly, it is paid for by corporations. Even when people do work in their 'spare time', it is being subsidized by the corporate job that puts food on their table. Arguing against directly funded open-source is tantamount to arguing that developers should only be able to make a living working for a corporation. There's nothing wrong with choosing to work for corporations, but what's wrong with having alternative economic mechanisms as well?