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Installing a desktop application implies 100% trust in the service provider. It is the hypothetical security equivalent of them gaining privileged remote code execution on your web browser--a vanishingly rare security event. Proof of security concept: the provider can do significantly more to your device with the desktop app.
Trust has many facets; Discord ...
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Maybe not an answer to the question, but useful info for those who find this question while having this problem:
For people who use offline/local calendars, and notice their .ics export contains deleted events (even recurring events, and events from years ago):
It seems that indeed, deleted events are only "marked for deletion", meaning they still appear ...
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