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Using a chromecast without a google account?
(programming.dev)
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If I recall correctly it sets itself up as a hotspot (no Internet access) and your phone connects to it to set it up. It may use Bluetooth, but that could also be a different version.
AFAIK the Google Home app is required to set it up, but once set up you can remove/uninstall the app.
In terms of being on your network it will broadcast itself as available on your network.
It also does auto-update, so it will expect Internet access. (It also periodically checks for Internet access.)
This is what was confusing me, i thought it would connect as a client and couldn't grok the catch-22 of connecting it to a network without knowing its IP.