A bunch of their courses (including their algorithms courses) are in Java, which makes me skeptical of how good their taste is. It's a strong red flag that they're just licensing content without any understand of the actual content matter and the quality of what they're teaching. I could be wrong, but that's definitely the impression I get based on both the fact that they're using Java and the classes are structured like traditional university classes, since not only are most university classes really mediocre (at best), but it also shows that they aren't taking advantage of the power of the platform/medium. Again, another red flag for poor taste.