Ah! More homework. At 5:20 AM I get a email from Dropbox saying they're deleting my account tomorrow. This is the subsidiary account that actually stores no data, but went over quota anyway some years ago due to a change in how Dropbox calculates quotas (making it possible to go over data quota with zero data). After doing this Dropbox sent me an email once a week for ten years saying I was over quota. Then today I guess switched to "fix it or we delete the account. 24hr deadline". Ok