But the internet is already completely decentralized and has been since the 1990s when we switched from EGP to BGP. EGP used to have a single, global "backbone", BGP doesn't.
The only semi-centralized part of the internet are the regional registries, although IANA is still the supreme numbers authority, but they don't care about what you do with your assigned numbers unless you hijack other numbers or acquired yours fraudulently.
BGP may be fully decentralized for IP, but if your only providers are your ISP and Amazon then your local industry has consolidated to the point that decentralization of the last mile and services don't matter. Two entities have full control of how your packets get to other people.
The decentralized networking the above poster is talking about is a layer on top of this existing 'polluted' network where your traffic is encrypted in it's own layer and goes to servers/services not controlled by said providers.
The particular problem I have with OPs idea this will give them some measure of privacy or safety. This isn't how law enforcement works. They will bust individual nodes and force the operators to keep them running all while gathering information on users of the network. They'll capture more nodes and unmask users with threat of even longer jail time to those that do not defect.