If you doubt that Sony could compete with Microsoft on a subscription service, releasing games day 1 whilst still make a profit, then you are agreeing with Sony's concerns. Microsoft have said GamePass is not making much money so if only one company can make a business model work by eschewing sector profits by propping that model up with profits from elsewhere with the intent of competitors being unable to match, you are describing classic anti-competetive behaviour.
I don't think that's what you meant to say, but in essence that is what you're saying. Then the debate becomes how much mutli-platform IP is it appropriate for Microsoft to acquire for this goal - which is what regulators are assessing with regards to Activision-Blizzard.
But - again - the UK CMA and EU regulators - are looking much wider. What's the impact to cloud gaming competitors, what's the impact for anybody else who wants to offer a subscription service, what's the impact for Steam and EGS?
Do you even acknowledge this is much bigger than Sony because you don't seem too.