from your explanation it means the rule is self contradicting and should be looked into for a rephrase. Because if its not illegal to own multiple accounts then banning all multiple accounts linked to a faulty user should be put in view. The rule can be rephrased to say one account to one user and owning multiple accounts at owners risk. Otherwise this rule is just self contradicting and should be open for review.
there is nothing contradictory. Forums also cannot limit each person to only having one account. Even several senior members here also have their alt accounts. However, they use the account according to the rules on the forum.
If a ban is applied to an account that is experiencing certain problems, it has the potential to drag in other accounts that are proven to be connected to the banned account. according to and what is contradictory and needs to be reviewed?
If you have problems with your main account being banned. there is a procedure for filing an appeal. You can try using it. I'm not sure of the success percentage of a possible appeal. admins may look at it on a case-by-case basis. which allows members to approve or reject their appeal.