Bitcoin is generally lauded for characteristics which align to those of a perfect currency; anonymity, fungibility, security, stability, etc.
Here is a short video to the other side of Bitcoin – I guess I would call this monetary autonomy – the ability to constrain the sovereignty of a unit of currency so that it had conditions associated with how/when it was used.
Remarkable when you remember that these constrained coins, once spent according to constraints, go back into the crypto wilderness.