Every company have their way of going Abuja their marketing and can chose whichever method they deem fit to achieve their target. Running a signature campaign here will depend on how big they are and if they have the finances to fund that but it will definitely worth it as it will show that they are serious. It's all about what they consider important to them and that is where they will channel their marketing resources to.
A signature campaign is certainly a smart marketing idea but it is also a choice to make, plus password recovery is different from other campaigns here, you need to have problems with your wallet to require their services and that doesn't happen everyday and they haven't exactly said anything against starting a signature campaign anytime in the future
I believe starting one would definitely increase their reach though.
Most of the campaigns launched here on the forum is majorly casinos and exchanges and I've not seen a service like wallet recovery launching a campaign. If this happens then that would be the first time I will be seeing a wallet recovery service a running signature campaign. The best thing any wallet recovery service can do is to make sure they build their reputation and be active in this forum to answer users inquiries.