Honestly, I don't think it matters if you share your account. As long as it isn't for competitive reasons. That's what I believe anyway. Graal also somewhat implies through words of like "Be careful who you let on your account" and so on. Not "don't let anyone on your account for any reason" . I don't know about account selling. But as far as I know it you wanna let someone on your account and you trust them it's ok, as long as it isn't for competitive reasons. Probably was against the rules at some point but people share accounts actively anymore. Even i let my friends on my account time to time to have fun with it.