Interesting, because in the root of my Dropbox is ".ws.agile.1Password.settings" which is a plain text file containing the "Dropbox App" path of "Apps/1Password/1Password.opvault" and my understanding of that "Apps" folder in Dropbox is that integrations can write whatever they like to it, but not write outside of it
I have a similar Apps folder for "O'Reilly" from back when I connected their app to Dropbox, and one for Joplin. It's too bad I don't have 1P 7 on my machine anymore, because I no longer have Dropbox on my machine so it would be a good test to see if it still syncs without the Dropbox client present