Again, interesting that an 'educational' site has no contact via their web site. On that merit alone, I would stay clear of the site. I'm also questioning the validity of your web site as well. Bet you don't respond to this comment!
An excellent tool for putting all your resources together
I think this would be a great tool if you were curating resources for a certain topic. If you are teaching about westward expansion and wanted to give students a wide variety of resources, this is a place you can put them all in one place. Students could watch a video, read original documents, and play games based on westward expansion by visiting this one location.
This is a great teaching tool as well as a student project tool. I was able to create a lesson with a links to video, google drive so students can collaborate on answering questions, Padlet for classroom brainstorming, Exit Ticket to assess understanding during the lesson, and Quizziz to assess learning at the end of the lesson. I teach third grade and my kids can easily work through each "frame" of the lesson easily. It allowed me to add a lot of different types of tech tools with one easy access point for the students. This lesson can be done as a class, especially good for using it the first time, or independently when the kids have become familiar with it. Students could also create their own Blendspace as a project, a good alternative to the usual slideshow report. I really like this tool and haven't found any glitches or anything I didn't like so far.