Doesn't lightning fix this? A coin joined UTXO opens a channel and the sats can move freely. Maybe not in larger amounts.
Discussion
Until exchanges are forced to remove lightning support because it went from a niche nerd thing to large scale privacy.
They'd delisted privacy coins for merely the *marketing* of them being used.
And then might go after lightning developers holding them responsible for for North Korea deposit with the exact same arguments used against tornado cash.
Also, GM :-)
"every LN node is a mixer" - soon

