Another possibly relevant aspect of crypto is that it is fantastically, painfully difficult; due partly to the real world consequences, and partly to the inherent challenge of the maths involved.
As a first hypothesis, perhaps the degree of difficulty makes the entire field exclusive enough that people have less need to hide behind obfuscating verbiage and let their ability to handle the maths speak for itself; i.e., they feel they have less to prove, in the same manner as high-status academics in other fields.
This would imply some degree of inverse correlation between the inherent rigor and difficulty of a field and the formality expected from the average researcher. Are, say, physicists or engineers typically more informal than, say, psychologists or economists? (disclaimer: this is not an attack on practicioners of the latter fields, just an observation that they are more removed from easily tested real world consequences, meaning it’s easier to bluff)