And yes, I mean RAM, GPU, motherboard, fans, etc advertised as "RGB". If it's the same price and includes LED, then for all purposes it doesn't have LED.
Not a single vendor supports Linux. Luckily some things have been reverse engineered, but it's very far from "just turn it off". Even on windows it sucks if you're mixing brands. MSI Mobo, Asus GPU, Corsair RAM, gonna need 3 separate programs running at startup to control those LEDs.
I get that some object to non-open standards on principle, but RGB is not a serious impediment to availability or use. Looking, there are non-RGB versions of most current-gen hardware available from popular resellers, and there are plenty of OEM options that are RGB-free. What I don't have racked somewhere else is in solid 'silent' cases with as few moving parts as required, but I bought parts with minimal/no lighting anyway.
I certainly hope that everyone can find something amenable to their situation, but I also feel that objecting doesn't help when an hour's work or research beforehand can allieviate the cause.