It comes from cheap 1080 panels being used for HDTVs. Example [1]. I bet Walmart sell a ton of these, though likely not to the HN commentariat.

And yes it does suck, but nice 16:10 aspect panels are still around, just a bit pricey.

[1] https://www.walmart.com/ip/RCA-DECG13DR-13.3-720p-60Hz-LED-H...