It is a vehicle for fundraising.
According to the whitepaper, it's not meant to be a vehicle for fundraising for just anything you want. Fundraising can take place only if it brings some value to Steem. It's very subjective but this case is quite clear - there is no value, or the value is even negative, as it hurts Steem's image.
Actually there are already "upvote me" charity post. That is something that could have been expected. Maybe not welcomed, but I wonder if it hurts Steem ´s image.