i think spammers would have a field day with that...
I see how spammers would create fake 'review my startup' posts to try and game the amount of front page time they got but if flagging is still applied to these posts then they would disappear quickly as people recognise that the submissions do not fit the 'review my startup' criteria and flag them.
Maybe I'm missing something obvious.
Perhaps an alternative might be reducing the amount of upvotes that a 'review my startup' post requires to get on the main page in the first place. Or perhaps some combination of the two.