They must be beneficial for the businesses that run them, so I'm not sure why the rates have dropped so drastically. Do people gamble on crypto casinos less? Are there fewer exchanges coming into existence? Most of the bitcoin-paying campaigns from back in the 2015-18 era weren't for ICO projects, and it's not like enthusiasm for crypto has died down at all, so I don't really understand it.
I have no idea what was the situation back then, but ever since I joined this forum and got into my first campaign (late 2019) I don't remember situation ever being better than it is now when it comes to signature campaigns. I remember situation being much tougher back in the late 2019 when even quality members that are now in some of the best paid campaigns of the forum had issues getting into any. Some even went to Bitvest that was paying like $10 per week for Hero/Legendary rank while situation now is completely opposite as there are more spots than quality members which enables shitposters to easily get into one.
But I remember the case with Prime Dice. They used to pay as much as BTC2.4 per month. And that was when BTC was trading at around $1,000 per coin in 2014. So they were actually paying four digits. Too bad that the campaign lasted for just a few months and after that they folded up.
No wonder that they stopped after few months as it makes no sense to pay so much for a signature. Iirc CM also payed some crazy high amount during last bull market but then soon adjusted the rates to a more sustainable ones.