They are illegal in some countries - because the odds are not shown and are often times done to such a degree that you have to buy thousands of crates just to get one decent item. When done well they're incredibly rewarding, though i value opinions usually.. but "f*ck loot crates" is not the most constructive thing in the thread.
Cosmetics for direct purchase will never get traded - as people will only purchase cosmetic items they want to use themselves. Which means the mtx system will not feed into the trading side of the game whatsoever - the only reason people will trade mtx is as a loop hole to get around paying real money for in-game currency, which is just shady imo. Loot crates when done pretty fairly introduce so many more cosmetics into the game in each crate cycle, introducing some rares, some dyes, some house ornaments which may only be seen annually, which creates hype for them as seasonal rares. Creating rarity creates desire, creating desire creates playtime, creating playtime increases game life span. Don't mean to go all rhymenoceros on you but man, be more construcive with your feedback, please, why? Why? Why 'cause I rap about reality, like me and my grandma drinkin' a cuppa' tea?
– either way, the bottom line from my PoV is that crates when done fairly are incredibly conducive to creating a functional trading economy as it stimulates far more trading than direct purchase cosmetics, counter-acts real money trading and is just a lot of fun. Those who don't enjoy crates just want all the good cosmetics without any work (grinding a lot of gold and buying it off someone) or spending a lot of money$$.
— Also.. As an added caveat regarding the legality of gamble chests, they're only illegal in countries in which gambling is illegal which is not that many places - and on top of that they have to also class in-game gamble chests as gambling, here in the UK they recently debated that they are not classed as gambling, but are in a blurry space - when the odds are shown they're perfectly legal so everyone knows what they're getting into. The main controversy was caused when it was proven through raw statistics on chinese private servers with free purchases activated that it took over 100,000 crates just to get a single top prize, and since that study the odds on crates have been made a legal requirement which has lead to a drastic fairness equalisation across the board for this system. The average win rate increasing from 1/100,000 to 1/1,000 on average in chinese games, western games seem to be even more fair than that, sometimes with a guaranteed rare after as few as 10 purchases in one go.
—- one last note just to give you an example: If a Glowie hat cost I don't know.. $50 on direct purchase, you'd be like yeahhhh awesome direct purchase.. You'd buy that, wear it around town and have no positive impact on the game outside of you growing your virtual penis. However, if there was loot crates where the odds were say.. 10% chance to get a glowie helm (random helm), and they cost $5 each, you bought 10 chests and lets just assume you got the law of average results of 9 random items and 1 glowie helm after your 10 purchases, you got A glowie helm, as well as 9 fun dyes/ornaments/other misc cosmetics whatever they could be, for the same price.. However. You now have an opportunity to feed those items back into the economy through trading, you can trade your glowie helm for a different one you may prefer, you can trade your dyes for others people may have pulled from their chests, or gold, or whatever you please. It creates more interaction between the players than your virtual penis size.