If you are online for more than a few weeks chances are you saw this site. Coin-Birds.com is a funny site where you can (or not?) make money online buying birds and letting them lay eggs. You can then sell the eggs for money (supposedly).
Of course, at the beginning you must put some money into it to buy birds. As you have more and more gold you wait to withdraw the money earned. And only then you see that to withdraw money you need to have crystals. "What crystals? Why no one ever told me about that?"
Yes, they pay (and very fast I must admit) but only if you have a number of crystals. This rule is not mentioned anywhere and it only appears when you try to withdraw your money. So, we can say they change the rules of the game during the game. And this is not fair or allowed.
But how you can get crystals, anyhow? You guessed: buying more birds (that means deposit more money) or getting referrals. So, to get paid you must lure others to join and "invest" money in this. This is a ponzi scheme - you only get paid if you refer other users.
My conclusion: do not join this, you'll lose (maybe hard earned) money.
Personally, I managed to get paid one time, but I will never see another payment from them, as I will not spend a dime more on this scam. See a picture of my account below.
As a parenthesis, I got my money via Payeer. Payeer gave me a very hard time getting my account verified, asking a tone of photos and scans from documents, for the sake of security and correctness. They refused to let me use their payment gateway for a legit online shop like 3xmrr for security reasons, they say. On the other hand, they allow scammers like Coin-birds.com to have accounts in good standing.
Life is not fair, right?