This is concerning, I’ve chatted with the maker of coinos on Nostr a few times and he even listed coinos on my experimental website https://nostrstore.com/ . He seems like a cool dude, I know they have had pretty serious issues in the recent past as well including locking funds and losing account for funds do to server outages. I’m also good friends with Sergio on Nostr one of the effected, he said it was changed but luckily none of his funds were sent to the new address.