> That wouldn’t explain the delay

That and expected maximum market size (or, more precisely, expected shape of the demand curve) do, I thimk, explain the delay, and higher price even before considering subsidy from advertising/data revenue, because there are fewer units to amortize fixed per-design production line costs across.

4K OLED laptops are more available and at a much smaller premium, perhaps because people buy a lot more laptops than desktop and larger monitors.

They get money from the ads, they get money from selling your usage data, they get money by selling space on the remote for streaming apps, and probably through some other means as well.