Why is it a misuse to use "crypto" to refer to a currency whose design relies on secrets, but it's fine to use "crypto" to refer to keeping communications private using some secret information?
If airports, phones, and corner shops claimed they 'work in crypto' it would be similarly misleading.
Even Toly refers to himself as a distributed systems engineer, because building a blockchain involves more DS work than crypto work.
FWIW I work in web3/defi, used to work in PKI.