I will never understand why these kits sell as well as they do, as someone who is an advanced carnivorous plant grower, and hobbiest, These sorts of setups will work well for germination, but nothing else. A Venus Fly Trap left in that "Terrarium" would suffer from fungus, mold, and if in the sun, overheating. The medium holder is too shallow, Venus fly Traps like to shoot roots deep, and the fact that it is clear can also lead to overheating problems. one last thing is that in these kits, they usually include old seed, the seeds of most carnivorous plants do not last long if left in the wrong conditions.
For more information of proper care of VFT's you can check a multitude of sites out there, one of the best I have yet found is http://www.flytrapcare.com