The projects we created in shapeshark cannot be download and upload to a hosting site of our choice so all projects reside in their hosting space.
Using a hosting site of your choice is possible with the Plus plan. If you have Plus plan subscription, the Shapespark desktop application allows you to create a self-contained scene bundle containing all the files needed to put the scene on your own hosting. See: https://help.shapespark.com/hc/en-us/articles/360009008278-Host-scenes-on-your-own-server-Plus-plan-