Wiki article about the first brain image of a human upload (2031). Subpar in some respects, but initially a compliant worker and free to copy thanks to court cases ruling that the biological original did not have a legal right to restrict its use.
Historically there were plenty of rationalizations for slavery, including ones holding that slaves weren't really people and were on par with animals. Such an argument would be much easier for a mind running on a computer and with no physical body - "oh it just copies the appearance of suffering but it doesn't really suffer".
Wiki article about the first brain image of a human upload (2031). Subpar in some respects, but initially a compliant worker and free to copy thanks to court cases ruling that the biological original did not have a legal right to restrict its use.