If you want to rename "pivot" word and call your relationship something else, you just use ->as('name') in your relationship.
Model:
public function podcasts() {    return $this->belongsToMany(Podcast::class)        ->as('subscription')        ->withTimestamps();}
Controller:
$podcasts = $user->podcasts();foreach ($podcasts as $podcast) {    // instead of $podcast->pivot->created_at ...    echo $podcast->subscription->created_at;}