I would think someone disabled or with mobility issues would seek out those opportunities over local employment at a higher rate. People with visa/passport/country of origin issues would have issues traveling would be another group.

From my experience the health issues point is true.

When I used to work from office my day looked more or less like this:

a) WALKING to the car/public transport, b) sitting at a desk, meetings, multiple small breaks for lunches, chats etc., c) again some moving, coming back home, d) SITTING AT DIFFERENT CHAIR WITH DIFFERENT DESK AND DIFFERENT PERIPHERALS AT HOME.

Right now:

a) waking up, b) no one forces me to take breaks, c) I do not change peripherals twice a day, so before I was using two different keyboards and two different mouses and two different setups daily, now I'm using the same mouse and the same keyboard and the same everything in work and after work, this leads to RSI and after 8 years I'm facing carpal tunnel syndrome in near future, also changing chair even to a shitty one for a while is apparently much better for your body than sitting in Herman Miller ALL THE TIME (I have standing desk too BTW).

Self selection? I assume a very social person applies to more in person than remote jobs. I assume more reclusive people apply to more remote jobs than in person jobs.

Neither is a guarantee but it’s a reasonably safe bet.