Because it's cooler setting it up on your own than having an app do it for you. (Could even skip Termux really.) And most importantly, this sets up a full Linux

Because it's cooler setting it up on your own than having an app do it for you. (Could even skip Termux really.) And most importantly, this sets up a full Linux environment, which can be used from hosting a simple site to programming (even the site itself; don't know if that's what author did here or site was copied from their main system) and more.