I could see a P2P trading platform making use of this.

HodlHodl had supported Lightning network as the base currency (where seller's BTC is escrowed), then pulled it as they wanted to remain 100% non-custodial throughout.

Then Paxful added LN but only as a funding (and withdrawal) method for a BTC account balance.

So to-date, there is not a single P2P platform where someone can buy or sell bitcoin, using LN, without the BTC funds being held by the platform's custodial wall.et