Most of the businesses in the list are very easy to copy. There are neither rocket science, neither patents to protect them, neither big money to pay lawyers to protect their work.
Knowing how well the product sells, you can copy it piece-by-piece by saving a lot of time trying different approaches. Author of original product already did all the hard work guessing what will work the best. You just come, copy and profit from his work.
Knowing how well the product sells, you can copy it piece-by-piece by saving a lot of time trying different approaches. Author of original product already did all the hard work guessing what will work the best. You just come, copy and profit from his work.