I simply believe Apple/Microsoft were circling Figma for an acquisition. That would be serious competition for Adobe and I imagine they got scared and threw the kitchen sink at Figma. If you're Apple or Microsoft PM. Please make internal noise to purchase a Figma competitor like Sketch and give Adobe/Figma a run for it money. Adobe clearly doesn't like competition.
One of their differentiators is their performant web app which is something Apple is very much against. Then collaboration where Apple is also bad at on top of iterating fast, which Apple is also bad at for software.