Let's say you managed to decentralize the Internet somehow. You have decentralized the software. What are you going to do with the hardware that connects to your newly decentralized internet? That's centralized as well. Most of it is probably closed-source. Can you trust your CPU, your GPU, and everything you connect to your USB ports (mouses and keyboards)? If we want decentralization, shouldn't we also build our own computers and the individual hardware components?

Some amount of paranoia is OK if you are being your own bank, but not too much.