The packages for VFT sales at retailers are designed for the purpose of promoting an "impulse purchase" of a plant that has very particular growing requirements. Close the sale -- that's all.
So these "cubes" show off a few healthy traps which only last a few days in that package. But -- at $7.99 -- the markup is big enough that they don't have to sell that many!
The plants slowly die in the store, and the after-purchase survival rate of those plants is likely very low, since the average schmoe takes it home, pokes the traps closed with a pencil, feeds one a wad of ground beef, leaves it on the kitchen counter, and then wonders why all the traps have turned black a week later. "I had a Venus Flytrap once, but it died."
...but even near-death VFTs can be easily rescued because the plants are quite resilient and will recover and thrive once the particular growing requirements are met.
Requirement #1: TAKE IT OUT OF THE DEATH CUBE!