"Were a traditional news service [...] to disregard" basically means "if a traditional news service disregarded [...]" but stressing the fact that it is (or ought to be) pretty unlikely, or purely hypothetical. Or they just want their sentence to sound more important than it really is. I suppose the term may be subjunctive mood conditional. Hopefully somebody can give you a more targeted answer there. But this particular pattern with the inverted verb is rather formal sounding. For example: 1) "If I were you, I wouldn't disregard it." 2) "Were I you, I wouldn't disregard it." Notice how the second phrase doesn't even have "if" in it. You can find similar inversions with "should", "would", and "had" as well.

I don't know the precise designation for the type of clause, but this is the subjunctive being used as conditional. Similar examples: "Were he to ask for my help, I would gladly give it." "Were it to rain all day, we would have to move the party indoors." "If I were you, I would start studying now."