I once stayed in a hotel 11 years ago with an ethernet cable which was awesome.
My guess would be the time they installed it. Those that were early had to pay more for the hardware and agreements and saw it as an optional extra charged at a premium.
Now that it's a commodity, the cost of hardware has reduced and simply giving a wifi password is simple for new installations. But those who did it earlier may not justify replacing it for something that's free, because what they have 'works' for them.
My guess would be the time they installed it. Those that were early had to pay more for the hardware and agreements and saw it as an optional extra charged at a premium.
Now that it's a commodity, the cost of hardware has reduced and simply giving a wifi password is simple for new installations. But those who did it earlier may not justify replacing it for something that's free, because what they have 'works' for them.
I'm probably wrong, but wouldn't be surprised.