Never heard of a licensing cost for that fundamental of a technology. Do you know approximately how much goes towards ARM vs in x86 licensing (if that even exists).
x86 licensing costs are complicated. The basic old 16-bit architecture is very well-documented, and while it's proprietary it's still implemented in hundreds of products and clones. Modern 32-bit and 64-bit implementations have a lot more ISA extensions that would be costly to license and hard to develop on your own. As a result, modern x86 designs can really only be made by licensing Intel or AMD technology.