Normally when we use the phrase "conflict of interest," we use it to imply a conflict between parties. One of the parties in your account is the blog author and/or their company; who is the other? The cryptocurrency community? They aren't a party in the traditional sense, and the concept weakens further when we consider the press campaign among cryptocurrency fans to rebrand their schemes as transaction substrates.

Framed as such, this seems more like an impassioned technical rebuke from an informed individual than a "conflict of interest."