This is a project I found a while back and have been meaning to try to make use of a Pi I have sitting around https://github.com/lanceseidman/PiCAST haven't actually used it yet but if you're looking to degoogle not moving over to some other mega corp is probably worth considering as well.
DeGoogle Yourself
A community for those that would like to get away from Google.
Here you may post anything related to DeGoogling, why we should do it or good software alternatives!
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Maybe not what you're looking for but using Kodi on Pi and laptops as Mediecenter.
Haven't used it, but Plasma Bigscreen has been recommended before: https://plasma-bigscreen.org/
Funny that google is one of the patrons :) Looks like a great solution though, thanks!
I saw this a few years ago but I am not sure if it will act as a replacement for chromecast