It’s quite pricey and complicated to do the strike integration. Plus it’s custodial and means that if you rely on it then the app loses its ability for users to build and run things themself aspect of open source. I suspect the second reason is why @jb55 hasn’t done it.  

 I think with the little complicated node connection for the direct zapping, Damus could also add this custodial service too and user decides what they take.