In protocols at least the solution is to design one that assumes a very hostile network and is inherently built for it. None of the old first generation Internet protocols are like that.
There's a lot to dislike about cryptocurrency but in that department it does represent a newer generation of protocol that is designed for the modern "dark forest" Internet.
All protocols should be designed with the assumption that you will face a well financed adversary at least as smart as you are who wants to destroy what you are building. All protocol work is security protocol work. "The Internet is a dark forest."