The correct answer to this open question is the following.
Some examples of materially enslaved things could be greed, the addiction to something that does us no good, bragging about possessions.
What Jesus of Nazareth taught was not to hang into material things that do us no good, such possessions that are the result of envy, greed, power, and control. If something controls us, we are enslaved to that thing, and it is going to end up harming us.