Why does Laravel respond with a 201 status code by default?

Can anyone explain why the status code of the response generated by Laravel would be 201 instead of 200?

<?php

namespace App\Http\Actions\User;

use App\Http\Resources\UserResource;
use Illuminate\Support\Facades\Auth;

class ShowMeAction
{
    public function __invoke()
    {
        return new UserResource(Auth::user());
    }
}

Middleware for this action is the default "api" middleware stack coming with Laravel 5.7 + spatie/cors + auth:api.

Other actions correctly return a 200 status code without me specifying anything…

Here's the failing test:

$response = $this->actingAs($user, 'api')->get('/api/v1/users/me');
$response->assertOk();

1) Tests\Feature\User\ShowMeTest::test_it_shows_the_authenticated_users_resource
Response status code [201] does not match expected 200 status code.
Failed asserting that false is true.