When spying on sample.com, I got the following redirect flow
sample.com > network1.com > network2.com > competitorsoffer.com
In this case, where is my competitor buying the traffic from?
Network1 or Network2 ?
From network 2 which buys it from network 1. Its a rebrokered offer.
Go to network 1 and work with them.
It's not really clear what you are trying to do, is it buying ad traffic on sample.com?
If you are talking about buy traffic, you want to buy from Network 2.
sample.com > network1.com > network2.com > offer.com
You want to work with the company which has the last redirect. Network 1 is buying from Network 2.