Arm dominates the microprocessor architecture business, as its licensees have shipped 150 billion chips to date and are shipping 50 billion more in the next two years. But RISC-V is challenging that business with an open source ecosystem of its own, based on a new kind of processor architecture that was created by academics and is royalty free.
article: https://venturebeat.com/2019/12/20/how-risc-v-is-creating-a-globally-neutral-open-source-processor-architecture/