Really, the funniest bit was playing some random battles with individuals, and having some of them rant about Sony even as they continued to play the game. Sure, they left a negative review, but then proceeded to continue playing. They couldn't bring themselves to abandon the game. The most hypocritical was one of them then talking about buying the battle pass.
And given that there isn't another game like this out there (and unlikely won't be without some considerable backing, which will lead back to a similar issue like this, just from a different publisher wanting the data), Sony still has them in their grip in the end. But I agree, Sony will figure out a means to mandate it on new sign-ups at some point unless a player is from a PSN-denied region (probably cross-validate the location based on the Steam profile's location, which is used for content availability and pricing anyway), while offering juicy carrots to get others to bend and create a PSN. It worked in the past, it worked for others, and it'll end up working when it does occur.