There could be licenses from CONCORD (as example) on buildings a titans, supercarriers, carriers. And the alliance should meet the requirements in order to get such a license (summary security status of pilots, minimum number of pilots, corporations etc.). Those who cannot meet such a requirements can obtain blueprints from rouge factions and build rouge versions of capitals only.
But there must be properly panel of requirements and they must be out of individials but irrelevant to any person or group.
There was a topic about capitals Too many Supers!. This could fit it well.
Even those people will be affected by disbalance.