Point out a single instance where Valve has been caught banning accounts at the request of other businesses. Of course you're welcome to make all the wild speculations you'd like, but I'll stick to reasonable conclusions in the mean time.
No different to as to using the VPN.
https://www.gamedeveloper.com/business/valve-bans-90k-i-dota...
2. I see no mention of Steam account bans in either link. Don’t know if you have additional information supporting Steam bans.
Banning unwanted players from a game is fair game. Locking them out of every other purchase too? Highly questionable.
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).