The EU has compelled companies to switch to Microsoft — yes, you read that correctly. The EU introduced the GDPR law, which significantly increased the complexity of using third-party services. To minimize this complexity, companies found it more straightforward to consolidate their services with Microsoft, as it facilitates easier compliance with EU GDPR regulations.
Once again, we can thank the EU for pressuring companies to use Microsoft products.
That seems like checkbox-compliance theater. Also doesn't seem to be supported by official findings. There are notions that actually you cannot be fully GDPR compliant with Microsoft 365. [0] Therefore state organizations sometimes do migrate to different offerings. [1]
Once again, we can thank the EU for pressuring companies to use Microsoft products.