A study by the Norwegian Consumer Council found that the online advertising industry is collecting and using personal data without proper consent, violating EU law. The study revealed that hundreds of entities receive personal data every time an app is used, which can be used for targeted advertising, discrimination, and exploitation. The council has filed complaints against several companies, including Grindr and Twitter's MoPub, for breaching the General Data Protection Regulation. The study's findings have sparked calls for authorities to investigate and take action against the online advertising industry.