Yeah, the question "what does the signal want?" is tricky, but that's part of the fun of being the OPS player, imo. It might have a coherent agenda, working across SRMs and agents, or it might be an inscrutable alien force, with no sensible motives or goals.
By default, I'd say the signal always wants to: break free, propagate further, and infect as many systems and minds as possible.