Have experience with it from buying accounts that had expired bot busting bans. Owner's of the account always claim that it doesn't matter since it's expired and it won't affect you, but the accuracy of this statement varies.
I've had experiences with this in both rs3 and osrs, and one consistency i can say for certain is that osrs is much tougher on bans than rs3. All my instances with rs3 were followed by a 2 day ban (after botting with an expired bot busting), while all my osrs experiences ended with an instant perm ban with that same expired bot busting ban. Just use your common botting sense regarding this, as any account can go straight from no bans -> perm regardless of the black marks.