Oh come on Tom. Making a great, free toolkit utterly decimated the competition. Just completely destroyed any funding for a competitor. And I should know.
I believe that you believe this is well intentioned, but it had a very negative impact on open source geospatial software development. Again, I SHOULD KNOW.
Mapbox is doing what is good for Mapbox. It's a company. But let's not pretend this change is good for anyone but Mapbox.