Might be that only fractional Nostr users have Lightning wallet. I had on LNbits, but then it was just deleted out of the blue. Luckily there were only couple thousand sats earned on Nostr.

I consider myself nerd, but the setting up that Lightning wallet as a web-browser user was not straight forward task. I really had to use my imagination to get all the required pieces added. Then the reward was loosing my zaps.

Few things which might hinder that zapping is not flying so well.