[bdhe]

Refusing to sign it and taking your business elsewhere is one of the best ways to let them know that you won't stand for this type of thing.

Although this is probably the best way to let them know, unfortunately real world constraints often mean that there are a very small percentage of people who are in a position to truly have a choice between not renewing their lease (in this example) and renewing it. Therefore, a company who is only being affected by those people who don't like their policy and have a choice to follow through will likely receive very little feedback. This is why, I feel, although on paper it works, in real life unfortunately one must insist on other ways to get our point across, including the ones mentioned in replies to the OP.