Maybe they thought an IPO wasn’t going to happen because the market would be in bad shape or there would be too much regulation there.

Maybe they were seeing the AI boom on the horizon and wanted the capital out now to deploy there. They wanted to chase AI not hodl some “old” pre-AI thing. A lot of people think AI is going to render the entire process of which Figma has become a key part obsolete. (I don’t.)

Those are two things I can think of to explain this behavior.

Also some people like to get out when they’re ahead. “The world is full of rich people who sold too soon, not rich people who sold too late.” This makes sense if you are generally pessimistic, which many are for various reasons.