Thanos
As an Eternal-Deviant hybrid of Titan origin, Thanos possesses physical durability that borders on the incomprehensible. He has survived direct combat with the Hulk, Thor wielding Stormbreaker, and the combined might of the Avengers. His cellular structure regenerates from catastrophic damage with remarkable efficiency. Even decapitation by Thor proved merely a narrative inconvenience rather than permanent termination. Yet Thanos remains, fundamentally, a singular biological entity. However resilient his tissues, he occupies a single location in spacetime. He can be targeted, tracked, and ultimately destroyed through sufficient application of force or narrative necessity.
The Internet
The Internet was engineered, quite literally, to survive nuclear apocalypse. Its decentralised architecture, born from Cold War paranoia at DARPA, ensures that no single point of failure can bring down the network. Destroy a server farm in Virginia; traffic reroutes through Singapore. Sever the undersea cables to Europe; satellite links compensate. The Internet exists as pure distributed redundancy, its information replicated across millions of nodes worldwide. Individual components fail constantly, yet the network persists. Even deliberate state attempts to suppress it, from China's Great Firewall to North Korean isolation, have proven only partially effective.