Can't help for the 2nd one. For the first one, I assume it's a mix of rust is amazing, a few initial libraries made it easy to set up crypto projects and it has

Can't help for the 2nd one. For the first one, I assume it's a mix of rust is amazing, a few initial libraries made it easy to set up crypto projects and it has grown into an ecosystem, for low latency bit banging like you might need to do trading on a Blockchain Rust will be much nicer to work with than C++ and finally, cryptocurrency needs to project as much legitimacy and safety as possible to keep up the charade, so on top of "military grade Crypto" why not throw "memory safe language, fearless itération, borrow checker makes complexity safe" etc. onto the pile and hope people assume because one part can be technically safe, everything will be