Many people screwed up waiting until the very last minute to redeem, for no apparent reason, or they took a risk transferring to BA, very well knowing the explicit terms and conditions.

And they would rather blame the airline (that fully honored the promotion), blame the agents (who are overwhelmed with dealing with overentitled crybabies), or blame the IT system (which was always terrible), rather than blame themselves.

And now they are trying to escape all responsibility by closing their Avios/IB+ accounts, claiming GDPR, etc? Good luck in life..