I find the paywall model using LN a very good solution. Much better than the traditional paywall implementations and than any model based on ads.

The flow is simple:

1. User accesses the content.
2. User is able to see a snippet.
3. User is shown a lightning invoice (QR) to access the rest.
4. User pays the invoice (a few sats perhaps)
5. User sees the rest of the content.

This has the following advantages:

1. Is very fast
2. Is very convenient
3. Is anonymous
4. Doesn't require intermediaries
5. The user is the client (not the product)
6. The screen is not polluted with useless ads.