First let’s be honest. Nothing is ever “deleted” on the internet! There are copies of it!
Privacy is not binary. Also, the faster you delete something, it's more unlikely that a crawler (or anyone else) created a copy of it.
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On the backed they likely legally keep a copy of everything for x number of years is my guess.
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We don't and we're FOSS.
We're not aware of any law (in any country) requiring us to keep copies. However, we're aware of GDPR which is about the opposite: the right to be forgotten.
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