Ah... but then that's not enough, you need to insure that the supply chain itself is 100% free! For example if you are using an Intel CPU, how can you verify it does what it says it does?
Enter precursor.dev ! Check this out if 100% free is not enough for you.
PS: honestly do what makes pragmatically your world, and that of the ones around you, better. Hopefully it is toward free software but IMHO if you have more agency with usage (which yes does overlap significantly with this) then it's a powerful step to keep on doing so.