These add-ons each require a service included in one of the Microsoft 365 enterprise suites (E3 or E5); each has reasonably broad appeal to knowledge workers; and each would likely have been added for no additional cost to existing Microsoft enterprise suites, based on past trends.
Microsoft is always ready to displace the current top-shelf tequila with a new top-shelf.
Perhaps Microsoft has done the math and calculated that add-ons will generate more money
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