That's a mischaracterization of TFA's point. Your re-phrase makes it sound like the proposal is for filthy-rich Microsoft to pocket additional bucks from other people's open source work. Ostensibly, yes, Microsoft will be doing such action but the spirit of TFA is more like for Microsoft to act as a tax collector and, crucially, redistribute the collected tax back to the community---the money will not add to Microsoft's $3.4T-worth coffers!
Naturally this comment isn't a "fuck yes!" to the idea of Microsoft-as-tax-collector but if we're discussing TFA, let's not be needlessly cynical to the idea presented.