I think it's a case to case basis. If I were a moderator and I see an account just days or weeks old spam upvoting in other threads, I would be suspicious. So I guess it boils down to how old your account is and past activities. My reddit account is years old with not much activity but I don't get banned despite upvoting/downvoting/commenting in posts under subreddits I am not subscribed in.
What is considered an aged account? Is a 1 yr old account safe enough not to get banned?
I have a friend with a 5 yr old Reddit account with over 5k karma and he doesn't get banned despite silly posts he makes. So I guess tenure is a huge factor since I got shadow banned a couple of times with low karma account at times especially when posting links.