We are talking about end-to-end encryption. "Malicious homeserver" is literally the table stakes. If you trust your server, you can use anything. Go ahead and use Slack.
Awfully weak stuff for a cypherpunk-ish protocol. The CCC crowd that rabidly hates anything centralised, thinks it’s insecure and corporate, are probably having a existential crisis. Matrix is doing a terrible job fixing the issues, worse they seem to downplaying and denying too. And the Tech press seem to dismiss the issue believing Matrixs’ claims there isn’t an issue.
We are not denying these issues - we just dare to disagree that they are as catastrophic as some suggest.