Busted how though? It's not like McDonalds, for example, would use a Mc-branded account to post random things to reddit with clearly visible McDonald cups or whatever. They'd use some throwaway account or buy an established account and buy upvotes to target that account's post. Reddit has no way to punish them for that. Maybe the reddit users find out and get pissed, but the site has no attention span and they'll forget and move on in a week.