It is standard practice across the entertainment industry including video games.
Rights holders will demand that platforms enforce their restrictions. Which is exactly what Valve is doing.
Rights holders will demand that platforms enforce their restrictions. Which is exactly what Valve is doing.
Valve has been banning accounts for circumventing region restrictions for as long as the feature has existed, and long before Sony added their games to the platform. Just because these policies were designed to appease rights holders doesn't change the fact that it's at Valve's sole discretion to enforce compliance (at risk of losing publishers).