"Widescreenizing" 4:3 TV Shows

[kfbkfb]

On 2019-02-05, the Lost in Space (now called classic) TV series
was released on DVD (only) with a widescreen 16:9 image.

LiS was rescanned for the Blu-ray release back on 2015-09-15,
the resulting image was 1.37:1.

(A quick check using a 13" 4:3 CRT TV and an original release
4:3 DVD revealed that almost the same amount of image is lost
due to CRT TV Overscan as is lost due to the 16:9 conversion).

Some of the (USA) TV show reruns channels (MeTV ) are doing
(almost, thin black bars on the sides of the image) a 4:3 to 16:9
conversion, is 4:3 -> 16:9 conversion of TV shows being done
elsewhere in the World?

Kirk Bayne