Recently, there have been a few upvote=agree memes that made it to the front page. The reason that the poster is called a beggar because things like upvote-agree are seen as 'get upvotes quick' memes. It is like a famous person shouting out their friend, and now their friend is as famous as them. It is not the way to get famous on this website. That is why imgflip hates upvote beggars
About a year ago when i got started on imgflip i seen alot of upvote beggars post and thought everyone did that and that was fine and normal...i created a post like that and was proud of it, it took me a good amount of time, i wondered why everyone commented "BEGGAR!!!" now i know but then i was like, what did i do wrong, what is even an upvote beggar? I agree with that post too :)