Right but a demo is trying to convert people from not being a user into being a user. If you require an account to run the demo you are cutting A LOT of potenti

Right but a demo is trying to convert people from not being a user into being a user. If you require an account to run the demo you are cutting A LOT of potential customers out of your acquisition funnel. You are in effect saying "become a user to see if you want to be a user". If you can only give that experience to people that have made an account AND bought a game that's even more you've just dropped on the floor. Whereas dropping someone right into the demo/game/product with no obligation shows them the value proposition immediately. This doesn't just apply to games, building a new programming language? Embed a web playground with your hello world example in the landing page!