I'm a bit concerned by that as well. Especially for robots with integrated cameras. I don't mind LIDAR sensors as much. Sure, they might leak my floor plan, but I would accept that risk.
Unfortunately, it seems like most robot vacuums these days are Chinese. Especially if you want vacuum+mop combo with some nice features.
(Whichever one I buy, I'll also be adding it to IoT VLAN. Separate them from the rest of my network).
In isolation no, statistically they can get a big insight into the population. I’d rather difficult a hostile foreign power from getting as much info as they can