Because their compliance is not an afterthought like the poster above said. You can't even assign an Office 365 licence to someone until you say what country they are in, so their data is kept in the right jurisdiction. I know someone will reply...blah blah no true scotsman...but compare that to most saas that doesnt even give the option
Google is an advertising company that is literally built on non-consensual data harvesting. AWS is an outgrowth of Amazon, which is likewise massively invested in data mining (though mostly on Amazon itself).
Microsoft's telemetry in end user products is known to tech savvy people but the company is mostly known for its operating system and office suite that most businesses already use. Additionally in Germany Microsoft used to offload its enterprise services to Deutsche Telekom (or T-Online I think) operating them for MS under the Microsoft brand, thus appearing even more trustworthy by effectively handing over control to a well-known German company. This changed but reputation sticks.
Microsoft is now double dipping (they charge for the product and also monetize telemetry). They own linked in, github, office, teams and windows, and are combining those surveillance streams.
They continue to support the CLOUD act as a "first step":
Because (NSA aside), they have been caught less often transferring private information and "stolen" company secrets to third parties ?