Hm, just got a #Matrix invite link, opted for one of the #web clients to check it out, then the welcome screen tells me that communication is end to end encrypted.
Uhm yes. E2E #encryption in a hosted application? How does that work without key escrow? Not to mention that I can't register anonymously. So either my email provider, Telco, #Google, #Microsoft,... can hack into my account.
Can't recommend this service if #privacy is a concern.