In a way coliving has always existed, also called shared house or residence for students. Coliving, coming from the famous coworking space (shared office), is a new and more innovating way of marketing the communication of those shared living space. With this creative term, it feels like a whole new living option has being created recently. Also there are two "new" main targets for those coliving spaces: the digital nomads (remote workers, freelancers, online entrepreneurs) and young professionals.
It is important to note that the demand for those spaces is growing fast as we have more and more nomads every year, but also, renting an apartment in cities like London, Berlin, New-York is becoming almost impossible in terms of price and requirements, so young professionals find the flexibility and price very convenient, and choose this solution over buying or renting a regular apartment, far from the center.