Comment by A1kmm

Or an unauthorised access / exceeds access to a computer system prosecution in at least one jurisdiction somewhere around the world.

If the owner of the system has a 'no ads' policy and a security mechanism to prevent ad servers from accessing their display without their authorisation, it is one thing if a company accidentally circumvents that by changing their page in a way that breaks detection (and unless there are records it was deliberate) they probably get the benefit of doubt from authorities.

But if they are blatantly going to quite great effort to circumvent the adblock security system to exceed their unauthorised access without the consent of and against the wishes of the owner of the client system, surely that's a clear-cut criminal case?

Of course, prosecutions of these types of things in many countries unfortunately tend to go after individuals who target big companies, but almost never the other way around.