I suspect it’s a matter of “people who are bad at hacking still want to ‘hactivist’.”
The Internet Archive is pretty implausible as part of Uncle Sam’s Zionist/military-industrial-complex conspiracy; but it’s disproportionately visible for its limited resources; so almost certainly easier to knock over than an actually plausible target would be. If only for fear of industrial espionage and because of NIST requirements your choice of defense contractors have at least enough checkbox IT security minions to make casual attacks more difficult; and actual Israeli nation-state targets are likely on the hard side.
