This is interesting to me, because although 23 million sold is a great number for games, it still appears low compared to other mediums. I'm assuming here that they're not counting PS+ copies of the game.
For example, Avengers Endgame got 350 million movie tickets admission, and then there's a whole swat of people who watched it on BluRay or DVD, or streamed it, etc.
I know it's not an apples to apples comparison, but it still shows how games are a niche market. There's so much less 'gamers' attracted to blockbuster games, than there are movie watchers, or even readers for that matter.