A while ago I responded to all of these, played along, and I made over $200 of bitcoin. Probably not worth my time but it was fun. I also sent tracking links, most of them are from China, but many of them operate in the US in New York. On of them told me she signed a “contract” to work America only to be stuck there and not be able to leave. If its true I hope they do something about it, in the meantime I will collect my free bitcoin. Know that once you accumulate on their lists, they become more persistent.