Editing Ewgruppe.net:Privacy policy (section)

==== Exceptions ====
The right to erasure does not apply if the processing is necessary
# to exercise the right to freedom of expression and information
# for compliance with a legal obligation which requires processing by Union or Member State law to which the controller is subject or for the performance of a task carried out in the public interest or in the exercise of official authority vested in the controller
# for reasons of public interest in the area of public health pursuant to Art. 9 para. 2 lit. h and i and Art. 9 para. 3 GDPR;
# for archiving purposes in the public interest, scientific or historical research purposes or statistical purposes in accordance with Art. 89 para. 1 GDPR, insofar as the right referred to in section a) is likely to render impossible or seriously impair the achievement of the objectives of that processing, or
# for the establishment, exercise or defence of legal claims.