The health of the platform requires that passive income be only possible to achieve by buying into it. If there's a way to game the system to get a hold of a stream of tokens in exchange for nothing, then it will be exploited and that part of the inflation will not benefit the ecosystem in any way. Unfortunately, that was the case on Steem where bid bot abuse ran rampant as it was possible to post no-effort crap and buy votes on it with a positive ROI.