Because on a meme the only message is to upvote without any enjoyable content. On a video there is five seconds of asking to like, then a whole video about something else that people want to see.
IF IMGFLIP USERS SAY "UPVOTE BEGGER" EVERY TIME SOMEONE SAYS PLEASE UPVOTE, THEN WHY DOES NO ONE ON YOUTUBE SAY LIKE BEGGER OR SUBSCRIBE BEGGER? ALL YOUTUBE VIDEOS START WITH "PLEASE LIKE AND SUBSCRIBE"!
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