Interesting, I see there is a commercial LN-enabled paywall offering as well:
Payment per blog post (Pay-per-Post) - BTCPayWall - Bitcoin PayWall to sell Content and Digital Goods on WordPress https://btcpaywall.com/payment-per-blog-post/ https://coincharge.io/en/btcpaywall-integration/ ($249 license purchase)
BTCPayWall was previously "Lightning Paywall", but was re-branded in February, 2022.