Thanks for adding the extra context! As I said, I don't have the necessary level of knowledge in physics (and also in cryptography) to have an informed opinion on these matters, so this is helpful. (I've wanted to get deeper in both topics for a long time, but life and everything has so far not allowed for it.)
About your last paragraph, do you by chance have any interesting links on "criticism of the criticism of string theory"? I wonder, because I have heard the argument "string theory is non-falsifiable and weird, but it's pushed over competing theories by entrenched people" several times already over the years. Now I wonder, is that actually a serious position or just conspiracy/crank stuff?
Oh wow, thank you for taking the time! :)
Just one question:
Is this because the alternate proposals appeared unpromising, or have they simply not been explored enough yet?