This and maybe there can be a layer of personal trust and vouching involved as well. Sprinkle in some I2P-like obfuscation and nintendoesn't get access to the files nor the participants. Basically a giant copy party that lawyers are not invited to.
In what sense? You need a true peer-to-peer internet before you can think about decentralized. The current internet is a highly centralized place and every effort to change that failed so far for various reasons. See the Skype story as an example.
Already today, people share the hot stuff on decentralized services (matrix, torrents, ipfs). There was recently a hn submission about a decentralized github. Of course this has tradeoffs, for example matrix doesn't have the fast cdn's discord has, but many people are ready to pay that price.
Did you tell Hollywood your secret? They're dying to know how to "trivially shut down" all the decentral media sharing going on for decades. Even China's Great Firewall has its hole-punchers (https://github.com/barry-far/V2ray-Configs). Maybe they have an opening for Grand Master of Reality position you can apply to.
That was a nice change of direction from "it's trivial to shut down" to "how many users are capable". And the answer is - basically every single one of them is capable, it's just a matter of motivation. The right tools exist, the learning curve is somewhat steep, but this is irrelevant.
Making something illegal isn't "shutting it down".
Your IPFS link is a screenshot of someone failing to access docs.ipfs.io in a standard webbrowser over HTTP.
Are you aware how many people use VPNs? Also take a look at how Tor Project hand out unlisted entry points into their network - IPFS could take a similar approach if it really came to it.
I think they're saying the actual Internet that underlies all those peer-to-peer protocols needs to itself become a decentralized network ("a true peer-to-peer network").
Internet is decentralized as in - it's divided into multiple autonomous systems under local control of the owners. Your examples are most likely about some github repo or a steam app blocked, but the thing is - that's not Internet, that's corporations that apply strict rules to their content. This is a completely different story.
The internet has tier 1 network providers that have to obey the law in every country they operate. It is not decentralized at all. Meaning, if I filter your internet at your local provider level you do not have another mean to get to the internet without filtering.
It is possible to block pretty much anything that the country wants to block. It would be impossible to bloack content with a truly decentralized (meaning only peer-to-peer network access) system.
As of today the only thing that comes to close to this is something like Meshstatic. Obviously it is only good for messaging and nothing more at this stage.