Hi!
As things currently stand, Core Decay is being developed primarily by myself, with no exact picture of how the final publishing situation will work out.
I can empathize with you - I myself don't use any big tech products or social media on largely ideological grounds, and while that's been preceding current events it's even more relevant now. Along the same lines, I completely understand choosing not to engage with US-published products! It's a somewhat moot point at the moment since the game is far from release and it's not certain how the publishing of the final game will be structured, but I can guarantee that if it ends up largely a US-based collaboration, this will be very clear and in that case you can make such a decision at the time. :)