"The social media platform formerly known as Twitter is worth almost 80% less than two years ago when Elon Musk bought it, according to estimates from investment giant Fidelity." ..."A recent global survey by Kantar found that a net 26% of marketers plan to decrease their spending on X next year, the steepest pullback from any major global ad platform."

I cannot think of another business example where someone so clearly tanked an organization.

https://www.cnn.com/2024/10/02/business/elon-musk-twitter-x-fidelity/index.html