[Intralexical]

I do think there is a balance to be struck, because directed communication means the recipients of old messages are also stakeholders, such that maintaining a consistent record by default is a fundamental part of the "service" they offer. The message contents are different from e.g. secretly hoovering up click patterns. Matrix had some thoughts when they faced the same questions:

  The key question boils down to whether Matrix should be considered more like email (where people would be horrified if senders could erase their messages from your mail spool), or should it be considered more like Facebook (where people would be horrified if their posts were visible anywhere after they avail themselves of their right to erasure).

  Solving this requires making a judgement call, which we've approached from two directions: firstly, considering what the spirit of the GDPR is actually trying to achieve…

https://matrix.org/blog/2018/05/08/gdpr-compliance-in-matrix...