There are multiple real word applications for a blockchain besides cryptocurrencies. Crypto's are just one of a lot applications.
It can be used wherever a trustless decentralized storage is desired.
Some applications would be:
- Supply chain
- Digital Identity
- Data management between organizations
- Patient chart
- IoT
- Real Estate
And most of them don't need Bitcoin due to their centralized nature. Traditional database do the jobs better and if they need some kind of redundancy they can use distributed / sharding database.