Even in this poorly made comparison shot I made you can tell the difference between streaming and "self hosting"
(lemmy.world)
Jack Ryan S3 E3
Unless they were shooting with anamorphic lenses, that's still cropping 4:3 to 16:9.
The real issue is that AFAIK the show's never been remastered from film. All we have are DVD transfers - and filters on top of that.