I fail to see how ad blocking on the client side relates to prioritized network traffic.
ISPs are the only ones with control over the system to really hijack net neutrality anyway. Using a browser that blocks/replaces sources by your choice has nothing to do with that.
we'll let's help you with your issue: should content providers (reddit, arstechnica, etc) decide to de-prioritize those that aren't directly making them money, the effect is the same as net neutrality, (a tiered-access internet) is it not? Should Brave gain even a minority marketshare, you'll definitely see Google and Mozilla (and likely Microsoft) jump on board with similar solutions.
We've merely pushed the control from the ISP to the content providers. Does this mean it isn't a Net Neutrality hijack anymore?