What are the costs to get the full course?

I'm happy to be corrected if I am wrong, but as far as I can tell, for me, it seems that at Level 2 Lesson 5 I run out of Dark Matter. The only way to gain Dark Matter is to complete Tasks. But all tasks at this point are labelled as Premium, meaning you have to subscribe to take part. So it does not appear to be a free course with subscriptions for additions as I first thought. It is quite literally a course you have to pay for. Monthly. $30 or $50 a month, depending on your chosen package. The first couple of levels are to show you how it works, and to get you to want to become a paying member.