Case C-165/19 P: Judgment of the Court (Third Chamber) of 25 March 2021 — Slovak Telekom a.s. v European Commission, Slovanet, a.s. (Appeal — Competition — Article 102 TFEU — Abuse of dominant position — Slovak market for broadband internet access services — Regulatory obligation on the part of operators with significant market power to grant access to the local loop — Conditions laid down by the incumbent operator for unbundled access by other operators to the local loop — Indispensability of the access — Margin squeeze — Costs — Competitor at least as efficient as the dominant undertaking — Rights of the defence)