Case C-520/21, Bank M. (Consequences of the annulment of the contract): Judgment of the Court (Fourth Chamber) of 15 June 2023 (request for a preliminary ruling from the Sąd Rejonowy dla Warszawy — Śródmieścia w Warszawie — Poland) — Arkadiusz Szcześniak v Bank M. SA (Reference for a preliminary ruling — Unfair terms in consumer contracts — Directive 93/13/EEC — Article 6(1) and Article 7(1) — Mortgage loan indexed to a foreign currency — Conversion clauses — Determination of the exchange rate between that foreign currency and the national currency — Effects of a finding that a clause is unfair — Effects of the annulment of a contract in its entirety — Possibility of asserting claims that go beyond the reimbursement of the amounts agreed in the contract and the payment of default interest — Damage incurred by the consumer — Unavailability of the amount of the monthly instalments paid to the bank — Damage incurred by the bank — Unavailability of the amount of the capital paid to the consumer — Deterrent effect of the prohibition on unfair terms — Effective protection of the consumer — Judicial interpretation of national legislation)