Time to get real. If your blockchain:
* Has a CEO
* Contains pre-mined tokens
* Distributed tokens via an ICO
* Can execute a forced hardfork
* Doesn't use a consensus algorithm
* Can be changed in a short time.
...then it's most likely centralized.
It is more of the coins than you think. Take for example Ethereum:
* Executed a forced hardfork
* Has a central point, Vitalik
* 20℅ of the coins were pre-mined
It follows logically that Ethereum is centralized.
Here are the "gold standard" decentralized blockchains:
I'm a hardcore ideologist more than an investor, but the upside of having a blockchain that leaves central banks utterly incapable of taking control of your blockchain is that they are probably the most fundamentally economically viable too. That being said I still think Ethereum, Dash, Ripple and Cardano plus a handful of others are great coins, but for different and interesting reasons.
When it comes to distributed ledger solutions remember that Blockchain is Open Source. Be very mindful of the fact that Hashgraph is patented, meaning it represents an opening for central banker takeovers.
You have been warned!