In my country it is illegal to share, but not illegal to download, since when consuming you're not meant as a websurfer to know the source of that something. Should that law change, it cannot retroactively affect something that happened in the past. So I don't plan ever to share anything publicly, but only the very few things I'm very passionate about to the point I want to share them with communities of friends which you can access through invites only. Sharing a back up copy with your friends is not illegal either even if the EULA or whatever says it is, unlike for example in the UK.
I was specifically asking about cybersecurity in general.