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Like any tool, it can be used for good and for evil and the perspective of which is which depends on who you ask.

You can use device attestation to combat spam by making sure only authentic devices connect to your service.

You can use it to facilitate contact key verification together with a hardware key to ensure contacts know who they’re talking to.

I’ve used it to make sure that introductory promotions are only offered once per device.

On the other end of the spectrum you can use it as a DRM of sorts to make sure ads on your website aren’t blocked.