Yeah, depending on the speed of these vehicles, it seems like bike lanes are the appropriate place for them. A smart city could even offer companies an opportunity to fund the buildout of additional bike lanes if there aren’t any existing in the neighborhood in question
I think the problem is that if they're in the road their liability and required smarts go up a lot. Right now it sounds like they're at least partially relying on being the largest thing on the "road" and everyone else will naturally get out of their way.
A slow-ass cooler-sized wheely boy filling up the entire bike lane and stopping randomly, that'll be super safe for cyclists, yep. On the bright side maybe some of them will get knocked into traffic by people who don't bother looking for bicycles coming up behind them when they open their car door, never mind low-riding bots that are much harder to see.
A slow moving robot on a sidewalk in the worst case makes it inconvenient for pedestrians, and robs the rights of those in wheelchairs etc.
A medium speed robot in the bike lane in the worst case causes a fatal or broken-bone accident.