Case C-334/20: Judgment of the Court (Seventh Chamber) of 25 November 2021 (request for a preliminary ruling from the Veszprémi Törvényszék — Hungary) — Amper Metal Kft v Nemzeti Adó- és Vámhivatal Fellebbviteli Igazgatósága (Reference for a preliminary ruling — Common system of value added tax (VAT) — Directive 2006/112/EC — Article 2 — Transaction subject to VAT — Concept — Article 168(a) and Article 176 — Right to deduct input VAT — Refusal — Advertising services categorised as excessively expensive and not beneficial by the tax authority — Lack of turnover generated by the taxable person)