Imagine being able to hold BTC-backed dollars and trustlessly spend to any LN invoice. Marduk enables this. Could be a big deal for people who don't want to expose their rent money to BTC price volatility, but also don't want to or can't hold their money in physical cash or a bank account (for security, privacy, or other reasons). "Save BTC, spend USD" kind of lifestyle. At the very least could be a nice way for people to ease onto the sat standard.