Is STORJ Decentralised?

Could you please clarify if STORJ is indeed a decentralized platform? I've heard about its peer-to-peer network and the ability for users to rent out their unused hard drive space, but I'm still unsure about its level of decentralization. Does STORJ rely on a central authority or is it fully decentralized, allowing for greater security and autonomy for its users? Additionally, how does its decentralization compare to other similar platforms in the market?