I inspect all machines we buy when they arrive and so far I haven't noticed any blacklight bleed on any of our 2018 machines. Then again, I test them under normal circumstances and not locking myself into a dark cellar.
Many will use their machines normally from the get-go but what will trigger the problem is when they decide to use them to watch a movie at night, in the dark. That's when the backlight bleed will rear its ugly head. Sure you're fine right now but if your machine has bleeding it will show at some point...unfortunately beyond the exchange period for some. Fortunately, the 2018's seem to have great LCD's with barely noticeable to none backlight bleeding.
Pre-checking for backlight bleed in the dark is always a must for me! I might not use my machine to watch movies all the time but when I finally do, I do not want to regret my purchase.
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rMPB 2015 13"
first picture is plain black image, backlit 50% in full dark room
second and third one - view from angles
the last one in 100%
I understand it is not very good, but most of laptops have even worst bleeding (razer, hp, dell XPS are much more worst comparing to average apple) so I would live with it!
The first image is a true representative to actually seeing your screen in complete darkness (I'm assuming it's on max brightness). The rest shows an exaggerated bleed due to camera exposure. Your machine is actually not bad but mine is better (and so are the other ones I got to inspect at my friends'). In my observation, 2018 MBP's have lesser to none backlight bleeding so exchanging your unit will get you a good chance of getting a better one.
UPDATE: Oops, sorry. but you did mention you have a 2013. Yes, unfortunately, 2013's have widespread backlight bleeding but to be frank, yours is really not that bad based on the first image. Just compensate by turning your brightness down and that slight bleeding will not be that noticeable.