Are offers to repair Credit for a fee a Scam ?

[Alex Hamilton]

I always thought that nothing could repair credit outside of time and money.  Bring delinquent accounts up to date, pay them off or wait until they stop reporting.  However, I see people here on Bigger Pockets claiming they can  remove a Bankruptcy, Charge-off, remove  collections, Late payments, and inquiries if I pay them a fee.  Is this possible?  Your thoughts