Art. 22 DPO
Articles 16 paragraphs 1 and 5 and 17–19 apply mutatis mutandis to the right to data portability.
Several rules on the right of access apply by analogy to the right to data portability: the written request, cooperation in identification, responsibility where there are several controllers, the 30-day deadline and the exception to free-of-charge provision (Art. 16 paras. 1 and 5 and Arts. 17–19 DPO).
You proceed in the same way as for an access request: ask in writing, cooperate in being identified and expect a reply within 30 days.
You ask your streaming service in writing to hand over your usage data. The service must respond within 30 days and may only ask for a contribution to costs if the effort is disproportionate.
Explanation by mydatenschutz.ch in plain language – not legal advice. The statutory text is authoritative.