Biggest example of the year is Gravity Rush 2.
Well, yes, it's true that more people are having a legitimately great time enjoying PUBG at this exact moment than will enjoy GR2 in its lifetime. The self-sustaining reason for that though is the way people enjoyed PUBG right away and the numerous routes they used to communicate that enjoyment to others.
Persona 5
Night in the Woods
Bloodborne
Hollow Knight
Etc
Kinda weird to get worked up about a list of games that are all successful, most of them wildly successful, by the standards of their own genre and market positioning.
It's such a difficult game that you learn through constant trial and error and luck and its real slow. Those moments of excitement can be rare. There is much to learn yet players are retaining their attention.
1) it's an extremely well-established psychological fact (which game designers frequently forget and need to relearn) that punctuated rewards are way more motivating than consistent ones. PUBG is quick to play when you lose and the thrill of performing well excites you to try again.
2) contrary to people who talk about casualization, the vast majority of massive left-field hits in gaming are actually extremely complex games that are notable primarily for being very clearly distinct and unique compared to other popular titles. The fact that there's a bunch of new stuff to learn that isn't the same as "normal" games actually helps put casual players and super-dedicated game hobbyists on more of an even footing.