Whaat? Well, I guess we have different laws then.
About 85% of all the other bikers I see daily are riding right on the sidewalk. Usually this works out fine, there aren't that many people to stop the bikes from easily passing them.
I understand why it would be illegal when the sidewalk is crowded with people, there's no way you can ride a bike faster than walking speed.
But yeah, I've yet to see such crowds on my travels.