Parking in Waterloo Region

[GtwoK]

So here's a question: we had company over to our house in waterloo today, and our driveway only accommodates 3 cars. A fourth car, we told them they could just park on the lawn. An hour later, that person had a $75(!!) ticket for parking on the lawn. I had absolutely no idea that was illegal, and have done it MANY times before. For what possible reason is that illegal? What is the expectation for people to do? On street parking isn't available, nor are any nearby public parking lots. Why can the cops tell me where I am and am not allowed to out thing on my property? Should they also be able to tell me where I'm allowed to put a couch inside my house?

This is utterly ridiculous and has me pissed off, and I'm not even the one who got the ticket. Who is being helped by this law?