Unfortunately today processor is dominated by Intel, AMD and ARM, so there's nothing much regular user could do. While open source alternative such as RISC-V exist, it's not very competitive in terms of price and performance. The only good news is Bitcoin Core already support RISC-V architecture and few linux distro have guide to run itself on RISC-V.
Nvidia was recently hacked and it was interesting to hear request from hackers.
They asked Nvidia to release their code and everything else with FOSS license for all operating systems Linux, Mac and WiNd0ws, or they will release all schematics, blueprints, code, etc in public.
Nvidia refused to do what they asked, so I think we can expect to see cheap asian knock-offs soon, that are going to be much cheaper than original Nvidia.
RISC-V AI Chips are open source but they are working with Intel on some projects, so you know how the money flow goes