Of course, the blockchain technology may well exist without cryptocurrency. Cryptocurrency is only one of the uses of this technology. However, it can be used and is used in many other cases where you need to safely store large databases in online mode, that is, in the mode of constant access to this database through the Internet by everyone.
For example, in my country, the blockchain technology is used by the Ministry of Justice to access citizens to information about the country's land cadastre data, that is, data on all land plots and their owners. For a small fee, any citizen can get an extract from the land cadastre on the state of any land plot in the country and it is very convenient.