The first 5 all have 1 reason, the coinpot exchange site. you can instantly withdraw from them, and put them in the exchange. you also get coinpot tokens which has a set price. it has a withdraw of 50 doge, the lowest of all of them, allows you to invest into other things. bonus bitcoin shares that reason, but also it's much more valuable and you can claim every 15 mins. free doge.co.in is because i need the ref's xd freebitco.in is a good place to just sit on your coins. you get 4.08% annual interest rate deposited at a random time daily, which can add up if you just deposit your coins there. Please use my ref links, I need some more ref's xd.