The fact that bitcoin can be so called "upgraded", which really just means changed, means it's not anti-fragile by default.  Being able to be changed is a actually a bad thing that makes it not anti-fragile, or fungible, or money in the first place.  It's why crypto will always be cryptocurrency and never money.  We are all just fascinated by complex Rube Goldberg machines.  Obfuscate something to the nth degree until nobody knows what it's traits really are or what it's really doing.

Ok, time to pump this here coin.  Oh, what's that?  In order to believe it doesn't have value someone is required to have a computer science degree and then spend years dissecting it's traits in order to figure that out?  And even then, multiple computer science majors will have completely differing opinions because it's almost impossible to be a master in all required subjects?  Perfect, let's create an ETF before anyone discovers.