There's at least one DNM using LN ( Tor-based instance of nostr:nprofile1qqs2xugc5jyguqkj36rk0syv4tmnkjdtmtperttl7x9rqjy3ustdcvcppemhxue69uhkummn9ekx7mp0qy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qg6waehxw309aek2mnyd96zumn0wdnxcctjv5hxxmmd9uxa0uz8 ), so it can't be 0%.

If you can see the flow of transactions (and thus are able to compare currency flows to those of other currencies) on a DNM, it's not private.

People spend Monero more because it's worse money (Gresham's Law).