Personally I find aliasing fun when it is not used to abuse Leagues and official statistics/standings. When you start creating multiple accounts on a League and start winning/losing games, you are affecting real statistics.
I'm not interested in the slightest what other games and sports do and do not allow. This is Worms Armageddon, not Heroes 3 HotA.
What I am interested in, is the fairness of competition, a balanced League with as accurate statistics as possible.
In this game, a players strengths and weaknesses are very important.
It's impossible to cover every scenario in schemes like Intermediate, Elite, Hysteria, BnG, etc. Knowing how your opponent plays is very important, when you study and understand your opponents strengths and weaknesses you will play certain ways yourself, you will avoid putting yourself in positions where your opponents strengths are amplified, and will try to put yourself in positions where your opponents weaknesses are amplified.
Not to mention, this is currently speaking an allround league, as far as how this system works, an alias has a clear advantage when it comes to picking scheme as they will know their opponents strengths and weaknesses, though their opponent will not know theirs.
Personally speaking I thought it was funny and interesting at first, now you're taking the joke too far and wasting everyones time.
Also there is a difference between someone changing their identity once and sticking to it to leave behind their past, and creating multiple accounts while generally being an idiot.