People are motivated to learn and build what inspires them. Some started web dev because they wanted to make the type of projects they saw in chrome experiments

People are motivated to learn and build what inspires them. Some started web dev because they wanted to make the type of projects they saw in chrome experiments that only run on the latest version of Chrome. Some people see very complex SPA apps and are inspired to make complex tools that can't just be done with HTML. Some get into web dev because they had a passion for browser and flash games. This list isn't wrong but also doesn't take into account the huge variety of web developers.