They signal they can't build something to outcompete Figma. Their stock price falls
They axe their existing competing product, and is therefore now way behind.
They face problems with the acquisition, which makes their stock price fall again because it signals that not only can they not build products they can't use their money to buy companies that do.
Then it's confirmed they can't acquire Figma.
Then they have to lose 1bn dollars.
And that money is going to a competitor that they took seriously enough to try and acquire at a sky-high price.