Growing pineapple in pot is not common in Malaysia. Everybody seems to be growing pineapples on the ground. When available land is limited, container gardening even for pineapples is the way...., the small way.
The growth of pineapple is so slow that we don't feel it growing. The growth is all about adding a new leaf in the middle, one at a time in a circular fashion. I would expect the leaves to get longer and the plant getting higher. Even with regular fertilizing and good care, I don't think the plant in pot will really grow as on the ground, but at least it fits the need for something very ornamental to please the tired eyes...