How can you conclude that? You have only heard one side of the story. The other probably goes something like:
> I hired a CTO who turned out to be incompetent and was unable to build the organization and take advantage of a great opportunity. When we finally convinced him to leave, the company was near failure and we had to raise money at a near zero valuation to keep the lights on. He's getting quite a deal with 0.15% for putting in no money when the rest of us had to risk putting money in to rescue his failure.
And there's no way to tell what's true. Usually in these cases both sides make themselves out to be saints and the other side is the devil, and best to just not believe a word of any of it without evidence.