Are the quality of the Loot Boxes received based on RNG?

Are the quality of the Loot Boxes received based on RNG? - Man in Gray Sweater Sitting Beside Woman in Gray Sweater

For my first 9 level ups I did not get any Loot Box quality higher than the common grade, the boxes with a white glow.

enter image description here

At level 10, I got my first "better than common" grade Loot Box, this time with a blue glow.

Some I have seen from others are boxes that come with purple and orange glows.

enter image description here

https://media.giphy.com/media/3o6gb7X6NwaUBI8EXS/giphy.gif

I am wondering, are the quality of Loot Boxes predetermined? Am I only set to get the rarer loot boxes when I hit bigger level milestones, such as every 10 or every 20 levels, etc.? Or is the type of Loot Box received completely random and am I just unlucky I guess? In the common box, I actually unboxed a legendary skin, seen below, so glows only guarantee you'll get at least a rarity of whatever the glow is. Contents below:

enter image description here






Pictures about "Are the quality of the Loot Boxes received based on RNG?"

Are the quality of the Loot Boxes received based on RNG? - A Woman Receiving Her Parcels while Standing Beside the Delivery Man
Are the quality of the Loot Boxes received based on RNG? - Woman Receiving the Package from the Deliveryman
Are the quality of the Loot Boxes received based on RNG? - A Woman Receiving Packages from a Delivery Man





UK Committee Says RNG Loot Boxes Are Gambling




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: cottonbro, Nataliya Vaitkevich, Artem Podrez, Kindel Media