You can find out a bit more about why I created Sequematic here. It started as a small personal project, and is now starting to grow as more people discover it and find it useful for their home automation.
I don't have plans to start charging for the service, however there is a cost for me to run the site and automation. I'm looking at including some small ads on some pages of the site to help cover those costs, and may introduce a donate button, but I don't plan to convert it into a paid service at this point.