Honestly, How do you know, you are not a slave?
I know “The best way to keep a prisoner from escaping is to make sure he never knows he’s in prison.”
― Fyodor Dostoyevsky
TL;DR
Free, in all cases, means not moved or forced, without any feeling of constraint: the mere fact of being able to make one's own life an experiment, without any authorization from any man, institution or government.
https://bitcoinmagazine.com/culture/bitcoin-offers-freedom-slave-by-design
Everyone with a mortgage, or paying rent, or with a salary below the average salary in their country should easily consider themselves a slave. So yes, I consider myself a slave, although I'm saving sats to end it.