There shouldn’t be any regulation of PlayStation, because consumers are actively choosing to buy into the PlayStation ecosystem. By the same vein, consumers are actively choosing to buy into the iOS ecosystem. No consumer has been forced into being part of the iOS or PlayStation ecosystem.
The argument is that when a vendor controls a large enough portion of the market, consumers might not be left with sufficient choice for market forces to prevent abusive behaviors. This idea has significant legal precedent and legislation behind it throughout the entire western world.
The question isn't whether you actively chose to buy into the PlayStation ecosystem. It's whether you had a meaningful choice available to you and whether the vendor is abusing it's market power.
