Hey Bob, great question! This is my favorite question, actually. While Pinata is a centralized service, IPFS is not. IPFS is like a giant truly open API. Anyone with access to a file can easily take that file and pin it themselves. In fact, that’s something we think more people should do. We’ve written about this before: https://medium.com/pinata/who-is-responsible-for-nft-data-99fb4e8147e4