Banned players playing on alt accounts still being toxic, proposed solution.

I wrote this as a response in another post, but let me know what you all think about it.

i'm not a super tech savvy person but I know my way around a computer fairly well and what I'm about to suggest seems feasible to me. Have the game client and riot servers make a note of the mac address of every device that connects to it (I'm sure they already do this) and if an account from X mac address gets banned, then that mac address gets added to a list.

Said list would be considered the "Super ban hammer mega highway" (name subject to change) and would basically be like a super nanny for any pc on that list. mac address X got banned on account X and then an hour later on another account mac address X is doing the same thing that got their other account banned? insta ban for the same amount of time the first account was banned for. The ban would end at the same time the first offending account comes off its ban, and would elevate all of the non main offender accounts to the same disciplinary status as the first account.