Who decides what counts as “disinformation” in the EU? Not public authorities, because disinformation is not directly sanctioned in the Digital Service Act (DSA) or other secondary legislation. Nor Very Large Online Platforms (VLOPs) and Very Large Online Search Engines (VLOSes), which avoid editorial decisions to maintain their legal status as intermediaries with limited liability. Instead, the delicate task of identifying disinformation is being undertaken by other private organisations whose place of administration and activity, purpose, funding and organizational structure appear problematic in terms of the legitimacy and even legality of the fight against disinformation. This blog post maps out the relevant (private) actors, namely the ad industry, fact checking organizations and so-called source-raters.