The fact that router vendors don't communicate this correctly to their customers or that they are configured wrong is, as the person sitting in the car using it across the street, not my fracking problem.
And another way is "Hey this door is unlocked, I'm going to go inside and help myself to anything I want. It's not my fault the owner didn't lock their door."
We get it. You're cheap and don't want to pay for your own connectivity.