Given that I know your situation, I have more than a "guess". I have a good idea of how these folks work. They go after the easiest, most attractive and lucrative targets regardless of fault. The hope is that they will simply cave in and pay due to the sheer of defending it.
Unless you have some special communication with DBP, why would you assume that because an event something hasn't happened that it is considered "purposeful avoidance"? If it hasn't happened, it is because they are targeting someone else or have their attentions focused elsewhere. Your assumption that they are "purposefully avoiding" getting information is flawed. It means they are not currently focused on you!
In any case, how would you know they have NOT asked for information from Domains By Proxy and simply sitting on it? Did DBP tell you that no one has asked for your information? If so, why would you question the good news?
Some people are wrought with fear and paranoia. It is almost like they are disappointed when things don't happen when they "should". Most people think that "their case" is so special that the trolls are working 8 hours/day on the case when the reality is that troll efforts are spread across numerous (perhaps hundreds) of alleged infringers at any given time.
As far as I am concerned, this is not a strange situation. It happens all the time. Trolls get it wrong, they target easy prey, or they have multiple cases going on at one time. I have seen it happen repeatedly over the years. No news is good news and you are overthinking this. There is no conspiracy over this.
You can't understand it because you are being paranoid and you think someone is focused on you. 3 years is the magic number. Don't overthink this and make it complicated. It isn't.
If you can't stand the uncertainty, you can always reach out to the trolls and self-identify so that the uncertainty goes away although I think that would be stupid.