Uh, the primary reason for the rise of sharecropping was that the North left the south destitute and bankrupt. Southern banks didn’t have much cash, and landowners couldn’t borrow money the banks didn’t have. Sharecropping was a way for a landholder to get land into production without the need to borrow money. I have no doubt many abused the process and used it to bind former slaves to the land through indentured servitude, but sharecropping began as a financial issue.
I would argue that punitive federal policy toward the south, the calculated effort to punish the south, to slow their recovery, was one of the primary factors which drove sharecropping, southern poverty, poor education for former slaves, poor or nonexistent health care, was the reality of all southerners fighting over scraps to survive in the first several decades after the war. Northern mistreatment also resulted in a great deal of resentful Southern Pride and affection for the confederate flag a hundred years after the end of the war. The stories and legends passed down in the south since 1865 are built around mistreatment, not nostalgia for plantation life. Most southerners never lied that life anyway.