How about in a month or so when you have to run a slightly different workload?
In fact both of them, actually Amazon too, invest in their own inference hardware and owns the stack.
You can't possibly think that these companies will keep shelling 50-100B per year in hardware alone where 60%+ is margin for Nvidia and not invest there.
If it's patents that are the problem then presumably all these large semiconductor companies have defensive parent portfolios.