It provides the content of the top 10 or 15 relays, and eliminates the need for a dozen different relays. Instead you have just one, plus whatever specialty relays you want content from. Plus they have a distributed network with access points all over the world so you get peak speeds no matter where you are. Checkout https://docs.nostr.wine/filter/readme 

 I’ll have to dig into it more to see what I’m paying for. I saw it suggest so tried it out and didn’t dig much deeper. 

Also I don’t care enough 🤣