They do not charge. But I don't see why zap splits couldn't be added for funding in the future in a similar method to Damus doing this before Apple made them remove Zaps.
Discussion
FYI Someone was kind enough to share a script recently that restores zaps on Damus. Worked like a charm 💪🏽 I’ll look for it if you need it
Here it is https://nostrscript.suhailsaqan.com/
It’s legit, but I understand if you’re skeptical, I wouldn’t click on some random link either lol but I can confirm it works
