Very good point on not wanting this to take off so that you know if you send it to someone, it is for their eyes only. It does seem like since both Signal and

Very good point on not wanting this to take off so that you know if you send it to someone, it is for their eyes only. It does seem like since both Signal and Matrix are open source, including the servers, that there should be a path to let one a Signal user know if they are sending it to a Matrix bridge and the encryption is no more. Also worth noting is that you do need to trust the person on the other end for Signal to have a chance at working, e.g. they can take screenshots or real camera pictures of the messages. So establishing trust with the recipient is rule #1, and this should go for if they are using a Matrix bridge with Element One too.