I mean, any FOSS project from anywhere could be being used by a fascist government or corporation, to be fair. That's literally one of the very serious and real downsides of FOSS. It's able to be used for good or ill.

I mean, it can easily be argued that the US corporate technology class has benefited far more from FOSS than end-users worldwide.

Amazon's EC2 especially:

Initially, EC2 used Xen virtualization exclusively. However, on November 6, 2017, Amazon announced the new C5 family of instances that were based on a custom architecture around the KVM hypervisor, called Nitro.

Amazon leveraged FOSS to create their own successful closed-source offshoot. AWS pretty much runs the web. Amazon... is not a good company.

That being said, the US has chosen to be isolationist, whether all of its citizens agree with it or not. Having less of a presence on the international stage, including in the FOSS world, is simply a consequence of isolationism. So boycotting US FOSS is likely to happen in some ways on purpose, and in some ways just from diminished international respect and involvement.