The problem here isn't merely that I must now enter into a contractual arrangement with Microsoft in order to do my taxes. It isn't just that Microsoft's terms of service are ghastly. It's not even that they could change those terms at any time, for example, to ingest my sensitive tax documents in order to train a large language model.
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It's that Microsoft - like Google, Apple, Facebook and the other giants - routinely disconnects users for reasons it refuses to explain, and offers no meaningful appeal. Microsoft tells its business customers, "force your clients to get a Microsoft account in order to maintain communications security" but also reserves the right to unilaterally ban those clients from having a Microsoft account.
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