We understand it can be upsetting to have significant changes in Conquest standings at the end of the campaign. However, the actions that were taken to disband and reform Alliances at the end of the Frendia are not considered an exploit and were use of the Alliance Scoring mechanics clarified here.
The intent of these mechanics are to ensure that guilds that are part of an Alliance are appropriately rewarded for their efforts throughout the campaign. Specifically we want to ensure that disbanding or otherwise manipulating an Alliance doesn't remove the Conquest that individual guilds in the the Alliance have earned. Manipulating Alliance membership to maximize the Conquest rewards granted at the end of the Campaign is an unintended consequence of this, but it would be difficult to prevent this behavior without preventing any Alliance changes near the end of the campaign, which in turn has its own problems.
We'll be evaluating this design but would love to have your feedback on how this can be improved moving forward. Please keep this strictly to feedback discussion, all other posts will be removed.