Though some fake twitter user are exist here but it is really very tough to
prevent them.
It is very easy to find them.
Just check history of account and followers - old accounts with large amount of followers take more time, but manual verification is the best.
Robots deliver now fake followers that twitteraudit see them as real..
Accounts mentioned in posts before have no activity and get a lot of followers in 1-2 days - it is obvious bot work, and followers are fake.
Also here is many accounts where someone just change name to be more crypto related, and followers have nothing with cryptocurrencies.
Paying for tweets from accounts like this is just thowing money..
Why someone will want to pay money for something like that?