Matrix, how it works and issues about privacy and GDPR compliance
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I sugest two reading if you want to better understand:
- "How Matrix works.
The entities behind Matrix.org and how they relate to each other.
What happens when you use Riot and synapse with only changing your Homeserver URL.
How your private data and metadata are sent to those entities most likely without your knowledge or consent."
https://gitlab.com/libremonde-org/papers/research/privacy-matrix.org/blob/master/part1/README.md
- GDPR and Matrix
https://gitlab.com/libremonde-org/papers/research/privacy-matrix.org/tree/master/part2
- "How Matrix works.