+1 one for the POSSE technique. Assume all walled-gardened platforms will be shut down eventually and only passion projects like personal homepages remain intact. Although even that's not a given. People just get tired and let the domain expire or lose enthusiasm and let the project rot. Archive.org might have your old site, but even that could go away given enough time. Impermanence seems to be a feature of the web, despite many saying it's a bug.