Clozemaster blocked in Russia

I made a few teaching collections for my Russian students, but several of them complained that Clozemater (the website at least) is being blocked in Russia, and can be accessed only through a VPN.

I imagine that it is being blocked by sharing the same IP or server with some other website that is being blocked (I can’t imagine why the government would bother especifically blocking a language learning website).

Is there anything the managers can do to solve this problem? It’s not possible to make all the students use a VPN to access the website.

Alternatively, the teaching collections could be made accessible through the app, this would also probably solve the problem.

Well - some of the collections say unfriendly things about Putin or things like слава Україні…