In Internet there is a lot of scammers, but there is also people who really can unlock iCloud for high price. But there is some kind of scammers that mask themselves as good unlocking service. I'll give you example to better understanding how they are doing that so you will understand and do not be scammed.
On Internet there is many popular websites that collecting information that should help you to remove iCloud in some way. But you can see that there a lot of news posted but you still not unlocked device using their help.
You should notice that there is new video of iCloud removal proof released by some guys every month, who don't publish any additional info. I'm going to tell you why there is this video appears and how to detect is new method true or not.
I used to check out everything before believe in to it, even if it looks true. During some time I inspected how do paid services interact with people, and what do they request for unlock.
I receive a lot of messages from different people every day. Each write me some methods that they found on internet and hope that it will help to get iCloud removed. We can't tell that this info can't be useful, that's why I'm verifying everything.