Well, you are cherrypicking using the RE example. Similarly, you could also also use many other multiplayer examples that sell more than the Sony games, like the (non-mobile gaming) most played and top grossing games on console (including PS) and PC, which are most of them multiplatform. Excluding obviously Switch, which has limited top seller 3rd party support due to lack of horsepower:
Not the case:
RE4 Remake is at 6.40M, but because released only 1 year ago. Capcom's games keep selling during many years, it will sell several millions more. Pretty likely RE3R and RE4R will end selling over 10M.
Which is more than what Ratchet, Returnal, Bloodborne, Demon's Souls, Sackboy, Demon's Souls, Days Gone or Death Stranding and many other Sony games sold. Sales that were ok back then but for future games that will cost over $300B (or even $400B) won't be enough. So they must get more money from any possible source if they want to continue making a lot of big AAA games at the same time.