One thing to point out - "ASIC" is more of a business term than a technical term. The teams that work on custom ASIC design at (eg.) Broadcom for Microsoft are

One thing to point out - "ASIC" is more of a business term than a technical term. The teams that work on custom ASIC design at (eg.) Broadcom for Microsoft are basically designing custom GPUs for MS, but these will only meet the requirements that Microsoft lays out, and Microsoft would have full insight and visibility into the entire architecture.