Happens to me once in a while on the Macbook. It doesn't happen as often as it used to with Linux laptops a decade ago, but it still happens every few weeks.
I'm still not sure if I prefer large touchpads or smaller ones because of this. You run out of space more easily with a smaller one, but there's fewer accidents. (And more places to rest your thumbs.)
Occasionally I've seen it move the cursor, but overall, it's a great experience.
I remember years ago I used to always disable the touchpad on my laptops, but I've been all Apple since around 2012 so hadn't thought about that until I saw this article.
I'm still not sure if I prefer large touchpads or smaller ones because of this. You run out of space more easily with a smaller one, but there's fewer accidents. (And more places to rest your thumbs.)