You are indeed right, if you assume development and support is free. But in order to keep developing, innovating and to keep people working there are just bills which need to be paid. Haasonline started as a hobby project in 2013 but just has grown towards a company, so selling a product and keeping administration is a normal to do.
In addition i would like to notice hat there is always a big difference between open-source and disclosed source. At open-source you can see developers going straight to there goals and at disclosed projects you can see the scope is always much wider. For example, most open-source crypto bots do not have a interface, but we do because we got the funds to make this.
Its also the company formula to keep innovating. We do not stop development, we just keep expanding the feature set and adding in new features. Its not abnormal to suddenly get a new bot because thats exactly what we do with the sales. Its a circle, license sales create income, we use it to keep growing and expanding and on the end we all benefit from it.