In a naive world it's called community. These days open source is a vehicle for multinationals to get suckers to write and test their software for free.
Microsoft has caught on to that, hence the move.
Microsoft has caught on to that, hence the move.
Lets for arguments sake accept your statement as fact. If that is a fact, is that inherently a bad thing?
If I use a piece of software, open-source or not, will I or will I not benefit from that software somehow obtaining better test-coverage? Ofcourse I will.
If that software is important to me, being able to contribute with tests or other "boring" or "light" material means that the core team can focus on further development. And I honestly don't have a problem with that.