Unter europäischem Recht hat man vermutlich die Chance, auf die Datenlöschung zu bestehen, erfordert aber extra Schritte und es ist natürlich fraglich, ob sich Reddit daran gebunden sieht - offensichtlich sind sie der Meinung, verfasste Kommentare sind Daten, die Ihnen gehören.
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Na ob sich das mit europäischem Recht verträgt. Ich glaube ja nicht.