What makes a project decentralized:
1) Is the creator known? Yes or no
2) how are the coins distributed? (Obviously the less spread out, and fewer large bag holders the better)
3) number of full nodes being run? (The more the better)
These 3 points are not that easy.
1) The identity of the creator is not important at all, what matters is if the creator has any control over the network. For example in a PoS does the creator own a lot of coins that he premined? Or does he have the power to change the blockchain and force a roll-back?
2) The distribution is not important, how the coins were distributed is. For example even if 1 person owned 100% of bitcoin circulating supply it still wouldn't change decentralization of bitcoin as long as that 1 person had bought or mined all coins just like anybody else could. What makes the distribution bad is the way the supply gets distributed for example when the dev premines their coin and out of thin air comes into possession of millions of his own coin. Or coins that give you reward for doing nothing except owning that coin!
3) Number of nodes is important as long as they are run by individuals (1 per person) instead of some company (like the shitcoin foundation) running a large number of nodes to create the illusion of a big network.