You can't use Kagi or Nebula without paying, so I don't really see how they're suffering from the free riders you keep insisting are some horrible epidemic. Almost by definition, if you're using Kagi or Nebula, you're already a conversion...are you saying a 1% conversion from advertising?
I have a collection of four hundred blu-rays and thousands of CDs. I pay for Netflix and Hulu and Amazon Prime, I pay for YouTube Premium and YouTube Music, and I don't use an ad blocker. I don't know if that falls into your criteria of "someone who can discuss this honestly", and of course I don't really have a means of "proving" this to you, but if you can assume I'm being truthful I don't think I'm speaking out of my ass here.