For its part,

Although RISC-V is officially open standard and not open source as Senators Rubio and Warner have charged , RISC-V International did in fact refer to RISC-V as an "open source, ratified ISA" prior to 2023. Ostensibly, RISC-V International's reason to change its language was to clarify that while the ISA is free to use, "implementations [of RISC-V] may be open source or commercial," just like how ARM is commercial.

RISC-V Issues Open Standards Warning As US Lawmakers Mull Restrictions comes via ChinaTechNews.com.