> - similarly, if a vendor leaks or sells my data and I start receiving marketing from somewhere I don't expect it's easier to trace the source of the leak (and in some cases just blackhole that entire email address)

This is exactly why I do it, it's eye opening to see exactly which companies leaked your address. As a result of being able to blackhole the leaked addresses I no longer get any spam, the Dvorak dream.

I actually caught a company outright selling my address to AWS of all places, I didn't even know Amazon purchased mailing lists.

AWS were crafty because they didn't directly sell a service, they only offered "resources" for "business leaders" because they knew nothing about what I might need.

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