Symas contributes to development of nostr:nprofile1qyt8wumn8ghj7un9d3shjtnyd968gmewwp6kytcqyryd36fvkxz8nq24jqh2g8x50ge4hnv6nevq3usfag9xpzxg2e24c5gdg3c . I personally don't endorse Signal; their idiotic MobileCoin venture made it clear their priority is profit, not user safety.
You actually *can* get secure private messaging without relying on centralized metadata storage or AWS.