Earlier quoted context omitted.
When exactly do you think the web was "decentralized"? The web the majority has ever interacted with has always lived on someone else's server. Self-hosting has always been rare. It's weird seeing people talk about some mythical history where the web was somehow decentralized.
Decentralized doesn’t mean that every website is distributed to user-local edge servers, it means that there isn't a single point of failure of the web (that is, the web is decentralized, individual sites are still, separately, centralized.) The emergence of central dominant vendors for key services reduces that (AWS, MS, Google, and CloudFlare are each capable of disabling a lot of the web with a failure; and there…
The web in real terms requires infrastructure for content to be available. Without that infrastructure you've just got dead links. But this has always been the case. There's no golden period to go back to.
The dominant players in the infrastructure business can end service for individual customers but they don't run everything. You can spin up a server and point your DNS records at it and be online if CloudFlare drops your site. They exist because it's cheaper to buy infrastructure in bulk and sublet it but that doesn't stop anyone from making their own server on their own infrastructure.
Edit: fat fingered button