Designer here - this above comment is 100% correct. The nuance is important that if a particular color palette is used in an original and distinguishable artwork that can be subject to copyright, although it’s a gray area. Colors can be trademarked however and that’s done all the time; for example McDs Red and yellow, UPS brown, The yellow of 3Ms stickies, DHLs red and yellow are examples. Those colors are only contestable if you use them on a similar product. You can color your dog house UPS brown without issue, but you wouldn’t get away with (for long) creating a delivery company with vans that color brown.