The "System Alerts invited you" dialogue box looks potentially malicious, as though it was a phishing attempt from a spam attacker.

Could you clarify: was this not a phishing attempt? And if not, where can I find more info? Thanks... :)
it's not phishing; sorry for confusion. https://twitter.com/matrixdotorg/status/999991655557140481
https://github.com/vector-im/riot-web/issues/6796 has a proposed fix.
Leaving this here for now for anyone who comes to github looking for information about System Alerts.
One thing that could also help here is to reduce the number of links to just the one which needs to be clicked - currently the explosion of URL previews and the markdown'ed link make it very hard to see what you should be reading and click one, especially given the main one is hidden as a MD link rather than a standalone URL.
I'm "blocking" this on a solution to https://github.com/vector-im/riot-web/issues/6796 because I have no other way to show that there's a link between two issues while keeping them both open.
Discord seems to handle this pretty well:


Edit: The link actually has the dialog mentioned above - https://support.discord.com/hc/en-us/articles/360036118732
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https://github.com/vector-im/riot-web/issues/6796 has a proposed fix.
Leaving this here for now for anyone who comes to github looking for information about System Alerts.