Society has deemed these signs to be illegal.
As a property owner, you are restricted as to what you can do with your property. For example, as a property owner, I can not (at least a hypothetical me, my condo corporation has the responsibility for some of these):
- Operate a grow-op.
- Operate a sweatshop in the basement.
- Have an unlicenced basement apartment.
- Turn my backyard into a scrap yard.
- Pave over the lawn for parking.
- Turn my lot into a 100 floor condo without due approvals
- Put up any type of exterior signage or advertising without due approval.
And I must
- Clear snow in a timely fashion
- Pay all due property taxes
I'm also sure that society embraces seeing those gawddamn Telus monkeys or Bell Beavers all over the city. Society, while supposedly embracing advertising, has also chosen governments that restrict advertising.