I think they no longer see twitter campaigning ad as profitable for them.
With more twitter campaigns coming up, users saw the potential of having high follower twitter accounts for the sake of advertsing with those in said campaigns.
Initially, this led to the farming of twitter accounts, especailly cut down to the taks of performing (/earning) well in the campaigns.
While this might seem like a good idea from a users perspective in the beginning, it drastically lowered the effectivity of the advertising method, which led us to the situation we are in right now.
It's true, it's an easy method and many people are interested on it to earn some extra bucks. But I think it's still effective using hashtags, so many other people will see it and the advertise can work fine. The followers aren't very important... I think the hashtags are the point.
Most twitter campaigns in here has their minimum requirements. How many followers do you have? Do you have a twitter account that has real and active crypto-related followers? If yes, then just take a quick look at the service board and you'll find a twitter campaign in no time. Otherwise, build your twitter follower list first.
Yes, I have a related crypto-currency account with this kind of followers. What do you mean by real followers? I don't know who are they, but we have a common interest and share tips and hints between ourselves.
The hard part is to find a campaign...