I recently migrated off of my legacy "Google Apps for Your Domain" (now Workspace) account to a mix of self hosting and a regular old vanilla gmail account.

It was a real eye opener to experience how challenging it was to move my data from one Google account to another. Takeout is nice in theory, but there is no equivalent "Takein" service that accepts the data form import to another Google account in the format produced by Takeout! I naively assumed "Export Google calendar from here, import same files to there" but nope, that did not work at all. Maps data was even worse.