I transcribe 5:26 of this video. I don't know that YouTuber's credentials.
So looking back here, what could possibly cause you to get assigned early? If we look right here, AMD shares are listed as easy to borrow. That's really important to know, and it means that the risk of early assignment is almost non-existent.
If we put something like Tesla in, they're listed as hard to borrow and that slightly elevates your risk. If shares are harder to borrow, calls are more likely to get exercised, which puts you in a position where you could be hitting max loss early on account of early assignment like we just talked about. And there's some smaller OTC stocks things like this [the YouTuber is pointing to ticker symbol TSOI] that are less not available to borrow. These, pretty much the second that they're in the money, are going to be exercised so that's the risk that you earn right there.