The word of God is pure, and without contradictions.
Jesus Christ came with the message of salvation which he preached and also commanded his followers to do same. there's no place in the Bible where Christ was delivering a lecture on how to make money. we can remember that he even told his disciples to leave what they were doing and follow him.

people that teach how to make money are not real preachers but business men.

Any preacher that tells you to give them money so that you will make more money is a scammers.

Christians should also desist their minds with the thought of becoming richer when they follow Christ. you went to church because you believed your soul will be saved.
if you want to make money — go and learn a skill or go get a job.

To be on the safe side, stay away from all of them.