The "decentralized" is not a requirement. For example, nobody really needs a "decentralized marketplace". They just need a "marketplace". Mediation and arbitra

The "decentralized" is not a requirement. For example, nobody really needs a "decentralized marketplace". They just need a "marketplace". Mediation and arbitration are well known methods when trust is missing. A joint venture with a database can do anything the blockchain community built more efficiently.