All this actual falsification of data certainly takes place in the publications. But it is really very difficult to do an objective study and it takes a significant amount of time. Few people can afford such research. Therefore, we will almost never get an objective result if we compare many sites. It remains to be content only with what is published, but it is critical of this information.
And about BTT, I think everyone knows very well, but they cannot seriously influence the opinion of individual, completely independent BTT users.
You are right most of the reviews sites are either to lazy to make out time to fine out the true nature of a casino by trying it out to have first hand information and also making contact with the right users to have their own experiences about the casino, that is why the responsibility is placed on the individual player to look for information about the casino their want to play on.
On the other hand some of this are so chucked up with corruption that their are paid to give out false scores in their reviews just to lure players.