I request, they serve. I can do whatever I want with their data on my machine. There's not even a contract here.
You seem to be confusing legality and technical feasibility with ethics.
"Unspoken understanding" in the context of a multi-million dollar faceless corporation. That actually made me chuckle. They're the first ones to break the unspoken understanding of paying proper taxes for example and I'm supposed to let them infest my machine with bullshit? GTFO.
I don't see what one has to do with the other.
stop freeloading on the open protocols we already have
It's semantically impossible to freeload on an open protocol.
It's technically possible to block ads, it's legal, and I don't like to watch ads
That doesn't make it ethical to block ads. Look, I use adblock too, so I'm not telling you to stop, but at least admit that it's ethically questionable.