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Apple isn't trying to make money with Siri. It's using Siri to make its ecosystem of Apple Music and similar more valuable to its customers.
The limits that Apple puts on what it can do makes that cloud side computation less expensive.
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Consider that bit - less expensive. Apple doesn't run its own cloud in the way that Google, Amazon, or Microsoft do. So what does Alexa cost? It costs for AWS cloud time. That's the expense that it's running. Those skills that people use run on AWS compute time rather than a phone's local cpu and battery.
A google search "costs" about 1 KJ of energy. Alexa has similar costs somewhere just for energy and other costs for the maintenance of the additional software and content. It costs something to maintain that joke database.
