That is common practice within the industry. You can deny but will probably not be allow to access the site. It depends on how the page is coded whether to allow access or not. I have not tested whether I can access SBO by not accepting cookies. Again, SBO is safe and if you desire you may clear the cookies when you exit the site. It may affect you login when you come back. Go ahead and give it a try. No harm will be done to your account.