Probably the most popular Dapps on the Ethereum is Ponzi Scam. - Fair Win.
https://concourseq.io/Q/FairWin.me
It is sad but interesting how it is possible that nobody has noticed it before.
Most popular where? Its just your imagination. And its has nothing to do with Ethereum/ everyone can create dapp or erc20 token, thats a beauty of decetralized smart contract network.