If someone cares about a piece of content's availability on IPFS, they can host it and anyone in the network can pull it from them without having to know a priori that they provide the content. That's what I mean by "anywhere". Anyone can provide any content they want, from anywhere, on whatever infrastructure they want, as long as there's a communication channel open with the rest of the network.

If you care about high availability of a piece of content, you will dedicate infrastructure to hosting it on IPFS, just like you would on the Internet.