Not everyone who indirectly cares about anonymity is an activist who feels they need to go to great lengths to disguise their identity. Sometimes anonymisation is part of a process, and the ability to collect potentially deanonymizing data this way is still a privacy breach.

E.g. imagine sending otherwise anonymised participants in a clinical trial a questionnaire, containing an image. The owner of the image could then partially deanonymize the trial participants. Or voters. Or demonstrators in a rally.

Not everyone who cares about privacy is Edward Snowden material.