How can I hide all posts that don’t have a thumbnail?

What filter / hook should I use?

You can use the pre_get_posts action hook.

Following Tom’s comment on the question about querying for what you want, maybe set meta_query to _thumbnail_id.

I would also ( group ) the conditionals to read:

“Is both not admin and is main query, AND is either home, category, or archive.”

add_action( 'pre_get_posts', 'thumbnails_only' );

function thumbnails_only( $query ) {
    if ( ( ! $query->is_admin && $query->is_main_query() ) && ( $query->is_home() || $query->is_category() || $query->is_archive() ) ) {

    $meta_query = array(
                array(
                    'key' => '_thumbnail_id',
                )
            );

    $query->set( 'meta_query', $meta_query );
   }
}

may want to replace is_home() with is_front_page() depending on your site settings.

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