Online entertainment streaming websites like Apple, Amazon, Spotify, Google, and eight other tech giants have been accused of failing to comply with the European Union's General Data Protection Regulation (GDPR).
European Union's data regulation law give customers the right to access a copy of the personal data that companies hold about them.
A data privacy activist Max Schrems and director at Noyb, requested them about his private data, however companies let people download a copy of their data, but some of the data was "intelligible and difficult to understand by people.
"No service fully complied," Noyb said in its statement.
The Austrian watchdog Noyb filed complaints against the tech giants with the Austrian authority on behalf of ten users.
Schrems said: "In most cases, users only got the raw data, but, for example, no information about who this data was shared with.
"This leads to structural violations of users' rights, as these systems are built to withhold the relevant information."
The companies could be fined up to 20 million euros (£17.7m) or 4% of a company's global turnover as per the GDPR.
However, Spotify released a statement stating: "Spotify takes data privacy and our obligations to users extremely seriously. We are committed to complying with all relevant national and international laws and regulations, including GDPR, with which we believe we are fully compliant."
