Roblox Co-founder David Baszucki said the company bought its initial users for $1 each using Google ads. "That was…germination of all of Roblox," Baszucki said. "If we were able to…reverse engineer…whole social graph tree all the way back to…[start] of Roblox, we'd probably see 1,500 users that saw some ad…like 'online building game, come try it out'," he added.