It wouldn't keep me up at night, but I just personally don't think that a buggy game with one map in early access should get it. I totally get that it might be responsible for some of the most memorable moments of the year for them (and others), but something about it just rubs me the wrong way. Hitman did a similar thing, but was so stuffed with features and clever mechanics that you can't help but admire the craft. PUBG is a one-trick pony that executes on that one trick incredibly well.
Again, I won't begrudge anyone who considers "which game provided the most unadulterated fun/memorable moments" to be the sole criteria for GOTY, but I personally think that's not enough.
I dunno, I have trouble articulating my feelings because I don't want to sound like I'm talking shit on PUBG (I'm not, I think it's dope).
I think the feeling is compacted because this year has been fucking jam packed with some of the absolute best releases in a looooong time.