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By syncing data, it isn’t all data, just that it requires non-local resources, ie cloud/API, to function. You do have to look at each integration to see what it is doing, I would expect a Spotify integration is just hitting the Spotify API and maybe can interact with local devices that Spotify can stream to (ie a Chromecast)
If Phillips wrote the plugin it might but all the plugins I have looked at are written by the community. Most plugins are only polling based, so they are scraping data into HAs recorder plugin.