Sure, you can mooch off their centralized server for a while. In an actually decentralized network there have to be multiple servers which cost money to run and that money is never recouped.
Many of the people on Tangled especially host their own Personal Data Service themself. It's fantastically cheap.
This seems like you either don't know much or you are super super cheapening out on credit. Fear uncertainty & Doubt is a low motive.