Not necessarily, at the moment Betfair is open to the general public and anyone who wants to explore their website can do so. You can play demo versions of almost all of the available casino games as much as you want, but you won't be able to place real bets on them. The same goes for the sports section: while you can view live stats and results of sporting events, you also won't be able to bet on any results without registering with Betfair.