Youtube Data API v3 - problems with quota usage - youtube-api

Question

In my application I want to use quota that is user based (requests/second/user). I'am sending random (for test queries) quotaUser with all of my requests. But, in the console, I see an increase in the overall use of the quota (project console view). The transfer of the quotaUser parameter does not affect anything. Perhaps I did not correctly understand the documentation on the use of quotas. Is it possible to execute more than 1,000,000 requests per day from multiple application users?
Here is my code:
$client = new Google_Client();
$client->setAuthConfigFile(SITE_PATH . '/vendor/access_data.json');
$client->setScopes('https://www.googleapis.com/auth/youtube');
$client->setAccessType('offline');
$client->setApprovalPrompt('force');
$redirect = filter_var('http://' . $_SERVER['HTTP_HOST'] . '/test', FILTER_SANITIZE_URL);
$client->setRedirectUri($redirect);
$youtube = new Google_Service_YouTube($client);
if (isset($_GET['code']))
{
$userId = rand(1000, 100000);
$client->authenticate($_GET['code']);
$token = $client->getAccessToken();
$client->setAccessToken($token);
$channelsResponse = $youtube->channels->listChannels('snippet,contentDetails,statistics,status,brandingSettings', array(
'mine' => 'true',
'quotaUser' => $userId
));
$videoResponse = $youtube->playlistItems->listPlaylistItems('snippet', array(
'playlistId' => $channelsResponse['items'][0]['contentDetails']['relatedPlaylists']['uploads'],
'maxResults'=> '50',
'quotaUser' => $userId
));
$videos = [];
foreach($videoResponse['items'] as $video)
{
$videos[] = $video['snippet']['resourceId']['videoId'];
}
while(isset($videoResponse['nextPageToken']))
{
$videoResponse = $youtube->playlistItems->listPlaylistItems('snippet', array(
'playlistId' => $channelsResponse['items'][0]['contentDetails']['relatedPlaylists']['uploads'],
'maxResults'=> '50',
'pageToken' => $videoResponse['nextPageToken']
));
foreach($videoResponse['items'] as $video)
{
$videos[] = $video['snippet']['resourceId']['videoId'];
}
}
print_r($videos);
}