Blender Skill Builder: Modelling Challenges

Hi, I want to know if the 3 different categories of models taught in the above course are eligible for online marketplaces like CGTrader or not? Since they are low-poly and in the case of the Dino model taught by Grant, I noticed that the geometry was intersecting in some areas.

Well if you noticed some things wrong with them it would be best to make them your own first and correct those errors!

Be even better to make up your own items, I expect the market is pretty saturated with the simplest basic items.