As said:
The ungoogled-chromium has been our choice to ship as default, then reading many complaints about the extensions we’ve got some doubts.
So we asked the community to express their preference and the community answered. See the poll.
They prefer privacy vs. spyware.
If you wish the google spyware-ized browser of course you can install it. It’s your choice 
I don’t know what the flatpak version is, maybe not-ungoogled?