You can create value by for example connectind lenders and borrowers. The money could be used in real economy, albeit does not happen too much yet today. For example, developing nation export companies can get a dollar loan with better terms they would get from their local corrupted bank.
Developing nation export companies can already borrow money through international markets. If they are going through the corrupt local bank, it's either because they are forced to by legislature (In which case crypto does nothing for them), or because they have corrupt executives who are getting kickbacks (In which case crypto also does nothing for them.)
