Yeah, I remember this picture from before. That's supposed to be a dark background, right?
First, it looks too bright. I keep brightness at 43 in Game Mode and backlight at 10 on non-HDR games. But settings are very personal and panels vary, there are no "absolute correct" settings you can get from the Internet.
Second, it's possible that your have your HDMI Black level setting wrong, which would also cause it to be blown-out like that. Which system is this?
Third, it's possible these credits are just a movie file that plays and therefore is compressed. Compression causes this kind of banding (AKA posterization). Load up
this Youtube Video, skip toward the end and make it full screen. I can see very similar banding in the dark background on my computer monitor here at work. How much of that is in the source and how much is just Youtube is unknown, but it's a similar effect but without the brightness issue.
EDIT - Also, the Steam Link is applying compression to everything you see so that posterization is something your going to see everywhere in any streamed game like that.