I wonder if there’s an advertising model, where somehow a relay is free with the trade off that some posts show up in your feed. Maybe a “proof of follow” that as long as you follow an aggregation advertiser npub, you have access. Wait, that doesn’t work.
Every time I think of a solution to this, there’s always a trivial client side solution to block the ads. Even now. 🤷♂️ maybe that’s a good sign.