For example that whole Horizon Worlds blunder.

Zuckerberg learned computer programming in his childhood. At about the age of eleven, he created "ZuckNet", a program that allowed computers at the family home and his father's dental office to communicate with each other.[11] During Zuckerberg's high-school years, he worked to build a music player called the Synapse Media Player. The device used machine learning to learn the user's listening habits, which was posted to Slashdot[12] and received a rating of 3 out of 5 from PC Magazine.[13] The New Yorker once said of Zuckerberg, "some kids played computer games. Mark created them."[7] While still in high school, he attended Mercy College taking a graduate computer course on Thursday evenings.[7]

I'd say this is enough to call him brilliant.

Just because he's an arrogant sociopath doesn't mean he's also a knuckle dragging idiot.