Random doesn't mean All champions.
Now i know the circlejerk here is that ARAM should unlock all champs, and that if you disagree you don't even know what Random is.
Personally i think that's all horseshit.
ARAM: All Random All Mid.
Nowhere in it does it say all champions have to be unlocked.
All Random => Everyone picks random All Mid => Everyone goes mid
so i did a quick google search as to what the rules for aram used to be. Nowhere is it stated you need to own all champions to be allowed into an aram custom game.
https://www.dictionary.com/browse/random The best definition for league is prolly the second one. Everything in a set has exactly the same chance of being picked. That set being the champs i own and want to play. There's no reason for me to buy anything i don't care about. somehow this notion started that you NEED every champ in the game. and at a high level i might agree, but fuck this is aram guys.
If an account runs only aram champs then so be it. I don't, and still manage to get a decent lifetime winrate. So why do y'all keep using those accounts as an excuse? you're the one who wanted to own all the champs. Why do you get a kick out of ruining someone else's fun just because you ruined your own? Then again some of you will stalk an account for weeks cuz they were mean to you once.
TLDR: the first All in ARAM doesn't mean all champions, it means all players. you're the one who had to be competitive and own all champs, don't come ruining aram for people who actually buy a champ because they want to play it.