League is supposed to be a very open game, anyone can start it, it's really easy to make an account and its really optimized so toasters can run it, they probably don't want to alienate new potential players with a headset requirement
Or they create voice chat and there's no headset requirement you just use your laptop microphone or something and you just have noise bleeding into the voice chat, it'd be a nightmare for people who are sensitive to noise
And we've had plenty of instances where some kid is excessively vulgar on voice chat (x box live, good times) so while the toxicity might be less frequent it'll be more agressive and potent when it does occur
Voice chats is probably more of a when then if at this point but it's got some problems that need to fixed 1st