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RE: What is U2F? If You Use Text Messaging As Your Two Factor Authentication For Coinbase/Gmail, You Need To Read This Now
I guess the only way to use it efficiently is if you auto-block EVERYTHING not coming from a specific set of addresses. That way you can use it, say, for messages coming ONLY from 1-2 crypto exchanges, ignoring any other messages.
Though such a feature needs to exist, of course.