I registered with them and, every year that I get paid, I funnel the money to a copyfighting cause. Check out
OpenMedia.ca for one such great option! Plus I write them regular letters as a member, haranguing the board and denouncing their policies.
Registered or not, they're still collecting money 'on my behalf' that only goes to fill their warchest. AC levies a fee on every bit of media that they can count being loaned, copied and read in schools and on campuses, caring not who's the author until you register with them and force them to cough up a share of the funds.
They're collecting money based off of my writing, your writing, everyone's writing: Canadians and other citizens! They'll pay out if you register, though and I figure that hurts them at least a little bit which works to our advantage.