They were trying to stop us from rooting? lol. I laugh at thee, LG!
Phone companies should quit that, and go more in the direction of warranty-only enforcement, because it's reasonable.
For example, Mazda (I used to fix their cars at a dealer), has a basic policy as part of their warranty rules that says essentially, if they catch you racing your car, they'll void your warranty.
Just the same, they sell three different levels of performance parts to tweak and upgrade your Mazda. The lowest level is covered under manufacturer warranty like any other part of the car. The middle level has a moderate 12K mi/12 mo warranty on the parts alone if I remember right. The highest level has no warranties whatsoever, and is considered a category of race-only parts, and as such, I'm pretty sure will void your warranty, or are at least emphasized as not road legal.
Yes, Mazda will sell you parts they make/endorse that are not road legal, and will void your warranty.
But that's fine! Mazda is simply making their stance as follows: They will cover things that go wrong with your car under warranty, but if you do things that take the car beyond the scope of normal use and evidence of manufacturer defects, as much as they build their own race cars and love racing, they will refuse to take financial responsibility for your own adventures. But they sure as hell don't go in and try to stop you from doing any of it.
Summed up: If you wanna have fun, go for it, but they won't pay for it.
Every phone manufacturer should do the same thing, and just make it VERY clear. What we do with our phones is our own damn business, so they should stick with just voiding warranties upon discovering an owner has rooted, and stop trying to prevent us from doing it.