I am fully in agreement that multi-tenancy is in the client's best interest, for the simple reason that there is no way a vendor can deliver the service as cost effectively under a single tenant model.
However...I am having a bit of a problem with this concept of "selling anonymized data to banks, other financial institutions, telcos, insurance companies, healthcare organizations." Whose data is it? It's the customer's. The vendor has no more right to take that data in any form, shape, or level of aggregation than a telco vendor has the right to intercept my phone call. The MT vendor is a carrier of the data, that's all.
I'm pretty sure vendors who want to do this have something in their contracts to allow it. But if I'm a customer of such a vendor, I'd either say no, or demand compensation for it.
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