They are a corporation. They exist to make money for ahareholders. The reputational harm of mass surveiling their peer corpos is colossal. Sure, their could absolutely be a rouge individual and we see it time and time again, but mass scale hovering of another companies IP? Nah, expecting that borders conspiracy.
Microsoft and their business practices are shit. It is very much a take it or leave it scenerio. Amazon, the competition, just went all in on M365 services for their operations. You expect that MS is actively stealing their data to enrich themselves. Sure, possible. Their teck would allow it, but I bet the service contract mandates consent and observation anytime an MS agent engages with Amazon's deployment. And I'd bet it all they honor that contract.
Why risk everything on spying? They are doing just fine sucking up the publics data when contracts aren't in place. Individuals should stay the fuck away but big coropos is another game entirely
Imo citizens united paved the way for the reversal. Billionaires like must are clear they need meet for the machine and the only meat that spends money is human