nostr:npub1j43pt6t2armkngn84945s3ns6zl68g9xx3w6jg25snanatz6zs6s40jvze nostr:npub169qcmq2rg4l8njzu4lc670xk5yqrq259d32vml80x3h7tjsqwecq89lszz Twitter originally has RSS feeds. They had to shut them down because of the server costs of delivering all that XML at scale.
nostr:npub1vc02gdzwpjalf2y9spkhu990clmgad8xp3et0wkmyyraxrexueqsyr44wl nostr:npub169qcmq2rg4l8njzu4lc670xk5yqrq259d32vml80x3h7tjsqwecq89lszz https://jsonfeed.org exists. RSS is one of the few shining beacons of what XML can do, and many sites still offer RSS feeds, so it's still relevant, while JSON Feeds are quite new.
Discussion
nostr:npub1vc02gdzwpjalf2y9spkhu990clmgad8xp3et0wkmyyraxrexueqsyr44wl nostr:npub169qcmq2rg4l8njzu4lc670xk5yqrq259d32vml80x3h7tjsqwecq89lszz The overhead for JSON is less but not by that much.