Ahhhh yes, although the Dragon motifs is expected but the two Dragons facing each other is even more interesting. Chinese restaurants and business do have a notoriety for decking their places of business like temples, for better or for worse (some restaurants admittingly overdo it). From my experience, within the elder generation, those Chinese who migrated here during the 60s, it carries real nuance and spiritual practice since those folks retained spiritual practices, whereas thanks to the "Cultural" Revolution in China, much of it died, or was watered down. Many of these folks actually have personal altars in their homes.
For later waves of migration, it became more a cultural gimmick (no different than an Atheist putting up a Christmas tree), and many will just give you a generic answer like, "Oh it's for good luck".
When I was in Taiwan, there was a festival when they literally set up altars with offerings in front of their homes, businesses, etc., to appease the Gods, ward off malignant energies from entering their dwellings/businesses, even sleek modern businesses like banks, high rises and corporate offices were doing it.
