Couple photos showing the problem.
Hard to say how much it is bent exactly but I could fit 2 pieces of copy paper, other side was a bit more but I could not fit third paper. Paper thickness is guess is around 0.1 millimeters, so gap it maybe 0.2 millimeters or little more.
My other phone (that has popping sound problem) has little smaller gap. This one in the photos also occasionally makes popping sound. My wife's phone is stright as an arrow and it does not make popping sound unless I really twist it, so it is OK.
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Check with the ruler. It is hard to see bare eye. I guess if it is bent enough screen protector will lift up. Mine seems OK for now as seen in the photos I have one installed. Interesting to see if it will lift up later due to bend.