You singled out cashu (which uses LN) and ark (which has a tiny footprint if used by thousands upwards).
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Cashu is trust-based, even if uses LN…
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Nobody claims otherwise.
LN is the glue that lets you use ark with cashu with fedimint with self-custodial lightning or with other custodial lightning.
Every ark user is also an LN user. Same with Cashu. But ark and Cashu allow these users to share lightning channels. Something we need desperately to scale to more users.