It's true. I purchased a SCF for my Galaxy S8+ and after maybe 2 months I have a crack in the bottom corner of my phone where the protector doesn't reach. There's a reason they give you two protectors because the instructions are NEARLY IMPOSSIBLE to understand.
I think they make the screen protectors smaller than the whole screen on purpose: so that you buy their $50+ SCF case to put on your phone with the protector, which is whack. I didn't feel like spending that kind of money on a bait and switch scheme and when I put on my current phone case, it lifted the edges of the SCF screen protector where dust collected and... you get the picture.
Anyone reading this, don't get the SCF screen protector unless you want to go all the way with them and spend $90.00 on a screen protector. $20.00 for the first 2 pack of protectors, another $20 on the next pack once you've learned how to put it on and $50 for the SCF phone case.