Case C-857/19: Judgment of the Court (Eighth Chamber) of 25 February 2021 (request for a preliminary ruling from the Najvyšší súd Slovenskej republiky — Slovakia) — Slovak Telekom a.s. v Protimonopolný úrad Slovenskej republiky (Reference for a preliminary ruling — Competition — Article 102 TFEU — Abuse of a dominant position — Division of competences between the European Commission and the national competition authorities — Regulation (EC) No 1/2003 — Article 11(6) — National competition authorities relieved of their competence — Principle ne bis in idem — Article 50 of the Charter of Fundamental Rights of the European Union)