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by BryantD 1280 days ago
I think it's probably as simple as these lines of code from wp-includes/feed.php in WordPress:

  $default_feed = apply_filters( 'default_feed', 'rss2' );

  return ( 'rss' === $default_feed ) ? 'rss2' : $default_feed;
WordPress is a popular enough platform so that people will adapt to its defaults.