You got it right :) It was on the web, but hadn't been audited yet (and lacked encrypted attachments and VoIP signalling and other good stuff). Now it's been a

You got it right :) It was on the web, but hadn't been audited yet (and lacked encrypted attachments and VoIP signalling and other good stuff). Now it's been audited (https://www.nccgroup.trust/us/our-research/matrix-olm-cryptographic-review/ https://www.nccgroup.trust/us/our-research/matrix-olm-crypto...), is available on Android & iOS too, and we have encrypted VoIP & attachments too!