I don't see how it's a quid pro quo for someone like Moxie, with his background, to advise a project for years and then work with them to integrate it given the alignment with regards to privacy initiatives.
I find it conspiracy-theory in nature to assume otherwise; I think it could've been handled better from a server source code side but I don't really see why this has to be an assumed bad faith thing.
It's quid pro quo to include an obscure scam coin out of the blue into an entirely unrelated product, with a public promise from the scam club owners to donate their money to your business. The fact the the owner of signal had already been associated with MobileCoin for a long time makes it worse, not better.
Signal including a cryptocoin came completely out of the blue (well, apparently there were rumors, but that doesn't mean it was an expected change). MobileCoin is also deeply suspicious in its mining model, and is not some well known coin.