Then protest by not using their services.
If you have ethical concerns about what they're doing, make damn sure your ethics are on target too (and Adblocks is /not/ being ethical - they're being childish).
What's wrong with people these days? A company decides to make money, and people get pissed off and try to find way to screw with them? How about the good old fashioned "make a big stink" (protests in the 70s, blogs in 00s) and boycotting?
To make a comparison, this is like Rosa Park bus boycott instead being the bus tire slashing. Same idiotic, thug type thinking.