Would you let a company engineered parasite harvest your bodily fluids in exchange for access to services that are normally supported by advertisement revenue? Maybe this is a biological implant they can remove from your stomach in five minutes to extract the material; maybe it infects your whole body and the usable byproduct is harvested through your urine. The concept remains the same. After that, they deposit credits into your service account and you can watch x minutes of Netflix. It is not exchangeable for real money. Assume there are reasonably negative side effects like sluggishness or diarrhea.
Does this cross your personal boundary? It seems like a reasonable question to ask with biomedical engineering being one the great new frontiers of technology. Also, for many people of lower socioeconomic standing, it's much easier to sell your body than it is to produce real goods and services, which is why prostitution is so prolific.