I know of excalidraw and perhaps penpot are there anymore?
Going public makes their shares liquid. It's (probably) not reasonable for the company to repurchase that equity or to pay employees pure cash comp.
Anyway, congratulations to everyone at Figma and good luck.
That said, today it's an incredibly good design tool - worth checking out before shareholders start the enshittification process. Congrats to the devs / founders for making it all the way to an IPO!
But Figma itself is excellent at what it does.