The primary function of BETH by its design is to serve as a ERC-20 token proving a claim to a share of another asset. In this way, it is manifestly a value transfer token to be used on the internal WORM market to procure WORM by minting.
It is, however, also an exact representation of burned ETH, which confers upon it a degree of ability to be used for transfer of value because it is both naturally made scarce and because its obtainment has an inherent cost denominated in ETH that is burnt (essentially being converted to BETH at a fixed rate).