Those of us who watch the Guix build farm [0] closely have identified the lack of capacity for building ARM binaries as a serious limitation.
As part of our efforts to improve the situation, I've applied for donation of aarch64 (64-bit ARM) computing resources for the Guix build farm: https://github.com/WorksOnArm/cluster/issues/254 This is the official program for getting donations of this type; it's a partnership between Equinix and ARM. Let me know if you see any room for improvement; the application can be edited. [0] https://ci.guix.gnu.org