In Thailand writing a bad review of a hotel can land you in jail. Defamation can be a criminal charge, and include opinions deemed to be unfair.
British Airways can’t get away with putting its critics in prison under U.K. law but they’ve updated their terms and conditions to say that they can close the mileage accounts of members who “statements..reflects unfavourably on the reputation of British Airways or any aspect of its business, brands, products or services.”
Their definition of “misconduct” now includes,
any conduct, including but not limited to making misleading statements, which causes, is intended to cause or is likely to cause a detrimental effect or reflects unfavourably on the reputation of British Airways or any aspect of its business, brands, products or services
Your statements do not need to be ‘misleading’ when you write them online or make them to others – the terms say that misconduct ‘includes but is not limited to‘ those that are misleading.
I could lose my entire mileage balance, it seems, when I write that British Airways first class is no longer even the world’s second best business class, behind Qatar Airways QSuites, since ANA’s new business product has come onto the scene. And writing about Avios being devalued…?
Airlines bury some extreme positions in their adhesion contracts. Delta says you’re liable to them if they steal your social media posts and they get sued. American Airlines says they have no duty of good faith or fair dealing towards you.