Hmm… that kind of falls under the category of a “shared account”
, which is strongly discouraged. There's always the possibility that a user can log into the account and use it to break the Community Guidelines, which could result in the account (and others associated with it) being blocked. To prevent that from happening, there should only be one person running the account.
If you're the owner of that account, then please change your password immediately and make sure that no one else other than you knows it.
The best way to prevent “hacking” would be to have a secure account password that is not known to anyone other than the actual account owner. Also, users should always sign out of their Scratch account when its not being used, so others won't have access to it.