That is ONE phone.......from LG that they chose not to lock at all to enhance sales. One phone does not make all Android phones.......
You can do your own research. I've wasted enough of my time.
Putting a stop to bickering with these people: back to the OP, another thing I should add is that outside of the U.S., other countries seem to enjoy unlocked bootloaders more often. So, internationally speaking, rooting is certainly almost always more available than jailbreaking. If you also talked to some of these guys behind iPhone jailbreaks (musclenerd, p0six) and the Pangu guys...it takes a long, long time and a huge amount of security research and work to find these exploits in iOS. Having the bootloaders readily open is a huge amount of relief for Android developers. Seems like only certain US carriers like Verizon are hell-bent on locking down phones and adding their bloat-ware. But internationally speaking, at least in Canada, it's quite nice how little the carriers interfere with these phones. Yes I get the suite of Rogers apps on my Note 4 but I can disable them and I have an open bootloader.