Am I financialy enabling child labor in 3rd world country by buying second hand fast fashion from Thrift shop and Vinted? Because I am not the one who originally bought the clothes from Shein. But buy buying it again from someone else I still use it uhhuhh this is complicated.
Your secondhand purchase incurs no responsibility for someone else purchasing a new product.
Secondhand is a very good way to not participate in the system of overproduction.