Yes. But on some planes, one spoiler can be raised while the other isn't, to induce roll. In full-scale aviation, that's called a "spoileron." In RC, people seem to use the term"spoileron" to refer to ailerons that can both be raised at the same time, to reduce lift. So the question is, are we using the same term - "spoileron" - to refer to two very different things, or is there another term for ailerons that can both be raised at once? It's not unheard of to use one term to refer to different things, and since nobody has offered anything different, maybe that's what's going on here.