I don't think his AI company is the issue, it's that he desired the effect of a public domain/unlicense, a completely unfettered gift, while he was constrained by the business people to use a copyleft license. However, most people using a copyleft license are using it with (some) intent, and choosing it with (some) explicit preference over public domain/unlicenses, i.e., they are not intending it to be an unconstrained gift, they want a social dynamic of code recycling only in the open and with attribution (each optional and with variations depending on the license, but those are commonly desired constraints).

It is of course fine to have his opinion, but if he thinks most people are in fact like him when they chose a copyleft license, then I think he's projecting rather than observing.