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1 year agoThe data subjects are identifiable if they can be directly or indirectly identified, especially by reference to an identifier such as a name, an identification number, location data, an online identifier or one of several special characteristics
By definition commenting reddit users are covered, even if they haven’t posted anything otherwise identifying – but most have either way.
Usernames are online identifiers:
https://ico.org.uk/for-organisations/uk-gdpr-guidance-and-resources/personal-information-what-is-it/what-is-personal-data/what-are-identifiers-and-related-factors/