It's because Imgflip is owned by a normal guy, and not some big company just out for your money.

Well, THANK YOU IMGFLIP! (User and Website) For not being a big 'corporate block' (yes, I call it that)

imgflip takes autonomous action on everything until the mods can review it. Obviously the imgflip staff is overwhelmed by the success of their site. Some douchebag trolls disliked a bunch of my meme comments, so now I can't give a meme comment because my rated posts are low. Not good to turn real control of the site over to the trolls of the leaderboard.