Simple. Throughout history there have been people who tried to make a buck by writing their own versions of the Bible.
Many of these so-called “ACTS of Whoever” and Gospels of Whatzis name” are exactly this.
Think of the modern book of mormon, Uranta, Ohasphe, Aquarian Gospel of Jesus Christ, and the 29th chapter of ACTs as examples.
So are people today trying to make a buck by saying their Bible (be it the Roman Catholic, Greek Orthodox, Ethiopic, or KJV) is the true Bible?
Sure millions of Christians wouldn’t do this, right?