Because the registration process mentioned – exactly it is called VASP registration according to the decree XXX (no. I do not recall) of the Ministry of Finance – is pretty easy, if compared with another countries. (BTW, it has de facto nothing common with crypto specifics itself, it is based just on AML regulations.) Simply just to fill all the papers correctly and if it is correct, you are entitled to be registered, no assessment on the merits. (If nothing has changed in the last ~0.5 year.) So it became quite popular – nevertheless, the downside is that as in the same time︀ it became known it is easy, especially financial instutions like banks and EMIs are now︁ not much eager to take this “licence” seriously. AFAIK.