I understand that you are new here, and probably very enthusiastic and idealistic about Memrise, but you should be realistic in your expectations, and understand the inherent limitations of a site like this that allows, and even depends on, user-generated courses.
You have to realize that for every junk course like this that you find, there are probably dozens of equally pointless publicly visible courses that you haven’t found yet, and probably thousands more private courses that you will never find, but what harm do those junk courses cause to you or me?
Yes, people can use them to “cheat” and get points that they don’t deserve, but due to the client-server based nature of Memrise, cheating on points will always be possible for those who want to cheat, and creating a junk course is not even the easiest way to cheat.
Memrise has very limited staff, and they have a difficult time just managing to keep the whole site from breaking every time they want to add a feature, or make a minor change. Just recently, the web courses were virtually unusable for almost two weeks, after the management ordered changes to the site.
In my opinion, the paying customers and content creators are much more likely to leave Memrise because of major functional deficiencies and technical failures, rather than because of these junk courses that can be found scattered here and there on the site.
As a very long-term Memrise user, I would much rather see the staff spend their time on fixing and improving core site functions, rather than wasting their time in an unwinnable cat and mouse game of chasing cheaters.
I have no objection to reporting these courses in the appropriate way when you do come across them, and if the staff care, and if they have spare time to check and remove them, then they can remove them to keep the course lists from getting overrun with garbage. But I think it’s important to understand that this type of housekeeping activity is likely to be a very low priority activity for the Memrise management and staff.