Obligatory: http://www.cryptoisnotcryptocurrency.com
There's a lot of important problems in (and around) cryptography that need solving.
To be charitable: Maybe some of them can be solved by cryptocurrency projects? There is some precedent here. (Zcash advanced the state of the art for non-interactive zero-knowledge proofs and pairing-based cryptography, Monero demonstrated real-world ring signatures, etc.)
But more importantly: There are a lot of possible solutions that need an incentive to be developed, and could potentially become profitable start-ups.
But it's sad to see that cryptography (a.k.a. the real "crypto") isn't even a seat at the table calling itself "Crypto".