Because if they can take all of the improvements from the fork, but the fork can't take any of their improvements, the fork will wither and die.
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That's not the case. There is already a massive ecosystem around MVT (vector tiles) that needs an open source renderer. Mapbox GL can have all the bells and whistles it wants, but since it's still tied to Mapbox's SaaS pricing, it's not a viable alternative for that ecosystem.