Sony IS to blame; they are the publisher and they are the ones who decided to make the publisher decision sell the game in regions where you can't make a PSN account, knowing that they would eventually force the decision. Arrowhead didn't make that decision and have been actively fighting for awhile.
Sony's notorious about hating cross play in general and are well known as the only publisher that demands monetary compensation to allow it. This is just them trying to gouge more sell-able assets from a suddenly popular title.
Sony's notorious about hating cross play in general and are well known as the only publisher that demands monetary compensation to allow it. This is just them trying to gouge more sell-able assets from a suddenly popular title.