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Chinese startup launching RISC-V laptop for devs and engineers priced at around $300
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
It's because of openness/royalties.
RISC-V is an open standard instruction set architecture based on RISC principles. RISC itself is just a design type. ARM is based on RISC too, but it's proprietary.
ARM even means "Advanced RISC Machines". They changed the official name to ARM but I don't think they actually reinterpreted it.