Be careful and double / triple check on help.steampowered.com/en/accountdata what information is stored on your account, especially chats, payment information, purchases, subscriptions and so on. But I agree regarding TOS if they ever find out the account will be locked most likely.
Just want to add you’re right but what pisses me off is that they still can influence decisions based on this. Let’s say his shares are sold at x day, just do some decisions before that and boom your auto sell share price is now either higher or lower. Only because it’s predetermined they still influence it and SEC now can’t do shit.