I recently changed phones. While trying to transfer Signal from one device to the other, there was an error and my Signal account was instantly locked for 7 days.
I contacted Signal support and was informed it was a security function and there was nothing they could do. I contacted them again to plead my case and never heard from them again.
I am sick of being at the bottom of the food chain with these companies and want more flexibility as far as interoperability goes.
Delta Chat gives me this in spades.