Yes, most people care about publishing referrals but they do not care about publishing their winning news, after they got the money why would they care about publishing.
Anyway, these events are real in most of the known and new exchanges to attract more users, but often these profits can be used within the exchange and cannot be withdrawn, but there are some newly listed projects that create a competition on their new coin to encourage trading, where they give traders who achieve the highest trading volume real profits in dollars that you can trade or withdraw.