This code snippet will hide the users, posts, and comments endpoint results and give 404 as the result, while the rest of the API calls keep running as they were.
::UPDATE::
add_filter('rest_endpoints', function(){
$toRemove = ['users', 'posts', 'comments'];
foreach($toRemove as $val)
{
if (isset($endpoints['/wp/v2/'.$val])) {
unset($endpoints['/wp/v2/'.$val]);
}
if(isset($endpoints['/wp/v2/'.$val.'/(?P<id>[\d]+)'])) {
unset($endpoints['/wp/v2/'.$val.'/(?P<id>[\d]+)']);
}
}
return $endpoints;
});
::UPDATE::
This snippet will remove all the default endpoints.
<?php remove_action('rest_api_init', 'create_initial_rest_routes', 99); ?>