Hi Matthias,
For point 2, there are several reasons for storing IP's. To mention some: - For Moderation: If we have abusive users on the community, we are able to not only ban users, but specific IP's. - If someone gains access to another users account, we can investigate what IP has been used to login to said account, and then ban the IP.
When it comes to device id, nothing is currently stored here. This would be used if we have a community app, which we don´t currently.
However, in adherence to the GDPR, we allow the users to know what is stored and let them manage their personal data themselves (which is, you can delete it yourself).
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