I don't see this as a negative thing at all. Quite the opposite, it's a very positive development.
+1
I don't see how being confronted with real-world uses of a program can hurt a developer. If anything, that will improve his work.
He is very motivated to keep bitcoin up and running, arguably more than if it was just a side-gig.
And him being transparent about it is also good. No reason to have to remove it from his signature...