Yes. I would say that there are some competing networks that resemble some features of the Bitcoin blockchain. However, the true nature of a blockchain is the fact that it's immutable—you cannot tamper with data. To have that property, you have to have true decentralization. Having a closed network without any incentive for a participant to enforce consensus doesn't create the condition for a true immutable and decentralized blockchain. In reality, most of the use cases that these competing platforms try to address don't really need blockchain. When you have a closed network of people who already trust each other, you don't really need a blockchain. That's why public blockchains that are enforced by proof of work like Bitcoin aren't a true blockchain.
On March 19th, 2018. See this statement in context.