Do you remember the early 2000′s?
In the early 2000′s, you could walk into your local game store and ask if they had a demo for a game that was coming out soon; they usually handed you a demo disc as well. These demos were for many major titles ; not just games with virtually no marketing and little interest . I have lots of old demo discs that date back to the early Playstation era because they came with the monthly printed gaming magazines. They were always packed with content back then and were the driving force behind game sales because everyone had a chance to try the the game before they bought it.