Why crypto Exchanges in comming more & more?

Today's crypto industry become the biggest industry in the world and everyone can want to get benefits from it. From some days Airdrops/Bounty become the trend in the crypto industry. The old exchanges cannot adopting these things, So they going back & back. New exchanges now realize these things and for there promotions they giving airdrop to there customers in the form of token which going to list in their exchange. By this more traders and more crowd taking parts in it and by this crypto exchanges become hit. So, there is the reason why so many exchanges are coming alive.