The Internet Archive is a precious resource that provides information to the People, for free. They hacked it because they were unable to hack the governments they're mad at. Just low-effort trolling.

I don't know. Maybe the arrest of Sabu had caused the OG hacktivists to disperse, although new hacktivists with ideals have spawned in the form of NAFO, Anonymous #OpUkraine branch and especially that one branch which often puts Taiwanese flags in CCP and UN websites.