21. British Airways right to terminate membership
21.1. In addition to any other rights or remedies it may have British Airways reserves the right at any time in its absolute discretion to terminate the Membership of any Member and/or (if applicable) the right of any Member to use the Card if a Member commits Fraud, Misconduct, is given a banning notice or withdraws their consent under Clause 4. British Airways must write to such Member stating their Membership is being terminated for this reason. British Airways may in its discretion suspend such termination and impose a reduction in tier grade and/or remove Avios Points and/or Tier Points and/or request undertakings in respect of future conduct.
I guess it comes under misconduct.
I feel a bit sad for the Ebayer, this seems a very extreme example of Johnny No Mates. S/he probably flies too much.