I dont really understand why they use someone else's blockchain? Or was it so conceived? Typically, projects that do not have their own blockchain for their investors suffer losses in such a market.
Not true, there are lot of successful projects that built on smart contract platforms. Creating independent blockchain costs a lot, it's not easy to do, specially in early stage, you need to secure it etc ... businesses create own blockchain when there is a need for that, like a project that requires a customized blockchain or when they expand their business.