The bitcoin value relies on social construct, i.e. we all believe in that it can become the medium of exchange and value store, the amount of investors, miners all making the system secure and valuable. The technical feature makes this possible, but another project can fork bitcoin and have the same features but will never reach the same level of value consensus as bitcoin. It may not even have enough mining power to secure itself e.g. the BTG 51% hack. Bitcoin is the first one and the one that has accumulated most trust and value consensus than any other crypto, and may never be surpassed.