The Ion Cannon was taken down because it was overpowered,
The explosion is way to devastating, and if we released this, blockland we become hell.
The Ion Cannon was incredibly buggy.
Nobody took down the Gas Grenade, and it could kill people outside of minigames. It already did terrible things, but if you made a brick with the following events:
OnPlayerTouch>SpawnProjectile>Gas Grenade
You could create tons of laggy explosions that kill everyone. Completely incomparable damage compared to the ion cannon.