The project looks interesting. An anonymous network is just perfect for this kind of service. I think this may be the most popular.
but as I understand it is possible only in those countries where services of this kind are legal
Do you personally know in which countries the cryptocurrency is prohibited in general? On my mind, only a couple of countries, and then not all cryptocurrency projects in them are prohibited. It all depends on the focus of a particular product.
There aren't that many countries where it is clearly prohibited, but quite a few where it is still a legal grey area.