What about Wire (groups up to 500, e2e, handles photos etc, Swiss firm, easy to use)? https://wire.com/en/products/personal-secure-messenger/ https://wire.com/

What about Wire (groups up to 500, e2e, handles photos etc, Swiss firm, easy to use)? https://wire.com/en/products/personal-secure-messenger/ https://wire.com/en/products/personal-secure-messenger/ And why's Threema out? You can hardly complain that there is no solution to your needs, and then, when one is offered, say "no need for yet another solution"...