I can only really echo what everyone else has said - this is/was an unbelievably useful tool in a world where airlines seem to have lost the will (or more likely the ability) to give us easy access to information about our flight changes. Thank you to Chris and team for all their work, and I'm sorry it's ended this way for you.
On a slightly related note, could GDPR cause problems for the wonderful ba97.com site as well?