"The principles of data protection should therefore not apply to anonymous information, namely information which does not relate to an identified or identifiable natural person or to personal data rendered anonymous in such a manner that the data subject is not or no longer identifiable. This Regulation does not therefore concern the processing of such anonymous information, including for statistical or research purposes."

As long as it's not linked to a particular profile ("pseudonymous" doesn't count, it could still be linked), it's fine.

https://gdpr-info.eu/recitals/no-26/