Cold Brew is glorified filter coffee, especially when made with ultrasonics.
It can even simulate the feeling you get when you go back to work while waiting for your coffee to be at drinkable temperature only to find it cold an hour later.
Cold brew coffee and cold filter coffee are two different things. Brewing at a cold temperature for a long period of time results in a very different taste which some people like and some don't. Note that the brewing temperature and drinking temperature are essentially independent; you can heat up cold brew and you can cool down hot brew.
