TheTigerMaster
Superstar
The weird thing is that in Toronto, I often see people walking on the sidewalks when streets are temporarily pedestrianized. I've often biked on the ActiveTO shared streets during the pandemic and have rarely seen anyone actually walking on the roadway. The notion that "streets are for cars and sidewalks are for walking" is very deeply ingrained here such that I wouldn't be surprised if no one walked in the roadway even if cars are "guests" in the space.
As others mentioned, its' because of the physical design. If you have a sidewalk curb, people are going to stick to the sidewalks. How else are they to know that they can walk on the streets? Get rid of the curb, and people will walk on the streets.
On the flip side, look at what happened on Queens Quay: There was no separation between the bike lane, tram tracks and "sidewalk", and as a result, pedestrians were walking in cycle and streetcar lanes.