When you own a short email address at a popular email provider, you are bound to get gobs of spam and more than a few alerts about random people trying to seize control over the account. Random people tend to use your account as if it were theirs, and often for some fairly sensitive services online. At last check, my account is listed as the backup for more than three dozen Yahoo, Microsoft and other Gmail accounts and their associated file-sharing services. This particular email address has accounts that I never asked for at H&R Block, Turbotax, TaxAct, iTunes, LastPass, Dashlane, MyPCBackup, and Credit Karma.”]
Source: https://krebsonsecurity.com/2020/09/the-joys-of-owning-an-og-email-account/