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 nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s hasn’t done it.