I'm curious if you've looked into Signal and if you think it's a viable alternative to Threema? Specifically considering Signal is fully open source (client and

I'm curious if you've looked into Signal and if you think it's a viable alternative to Threema? Specifically considering Signal is fully open source (client and servers), uses reproducible builds which allows you to verify that the source matches the app you're running, and is owned by a non-profit which can't be sold to a for-profit company.