

If you trust the initial install then unless there is a warning about the signing key you are good. Only signal devs can sign the builds so if you installed the play store version then updated with their standalone apk or fdroid version then it should just work as the signing key is the same.
Guardian project are just publishing signals apk files as the signature matches.
They need to put AI inside the AI next and add a couple more full screens of ads , some subscriptions and super ultra premium++ edition OS DLC for functionality to save files.