The concept of nostr:nprofile1qqs85cuynd5ymyxqm6vrfyjh3vfwz3l9dawhnmt9shxxfed23gfzw3qpzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhgqg0waehxw309ahx7um5wghx6mmdqy28wumn8ghj7mn0wd68ytn00p68ytnyv4mq8qa5ma is cool! 
The DVM analyzes the content of your recent posts and delivers events that are in a similar category. 

The resulting feed is still quite off topic, but that might be because of too little niche activity.  

 Interesting, I wonder if one could create more sophisticated algos then just categories  

 Sure, there are so many variables to tweak.