The thing is that no one has the authority to decide what "Web3" even is. It kind of implies a succession to the established Web 2.0 term. But Web 2.0 is also no clearly defined term, and it was also not established a-priori. I.e. the term Web 2.0 was somehow coined as a reference to a broad set of technologies in the Web sphere that were supposed to change the web. It is mostly associated with the evolution from the "Web 1.0" desinged for news-paper/static content style of content, to a web of rich, dynamic applications. The technologies often associated were the (then upcoming) HTML5 standard, plus advances in JavaScript and browser technology (stuff like AJAX but which existed in all major browsers when the term was coined). But these technologies were all on the horizon/in development when the term was coined.
Now, with the term "Web3", crypto enthusiasts try to establish it a-priori. That is, nobody knows exactly what kind of technologies/changes will be in "Web3" and even the problem it solves are not considered problems that need fixing by others. And it doesn't matter, because whether "Web3" will be a thing that changes the web as we know it will not be decided by evangelists, it will be decided when it has been adapted by the broad majority - and my personal take is that what currently is proclaimed as Web3 will not see broad adaption (by users, enterprises, network operators etc.).