There are lots of bounty campaigns which pay its users with BTC and ETH. For instance, this is the example of one https://bitcointalk.org/index.php?topic=5156163
Do not consider it as a paid ad
It's more like a Scam that they pay in Ethereum , now only pay the casino to those who carry their signature , and so it is better not to do bounty at allDo not consider it as a paid ad