[sp332]

I doubt an average sysadmin would ever notice, let alone knowing what to do about it, let alone putting in the time and effort to do it.

Anyway I'm not sure I put the responsibility on the right group. It will probably be down to websites choosing ad networks that respect their users' DNT settings. Just like they choose ad networks that don't host malicious ads or ads that take over the whole page.

[mynameisvlad]

That's a lot more probable, yeah. I doubt anything were to happen on the end user side to enforce this.