well, ...
it really depends how it happened.
I mean, there is what you saw and think happened ... and what was truly done.
joining an Alliance to spy on it is not cheating. losing a battle on purpose is not cheating either.
it's definitely not fair-play, but it's allowed.
multi-accounting is cheating.
but there is a difference between multi-accounting and babysitting for the sake of a spy operation.
that's why I say you shouldn't judge too hastily how Support manage such situations.
Have fun,