First: I'm estonian and maybe not objective. But, in my opinion, this "research" are little bit inflammatory. I don't count, but if every third word is "Estonian" or "Estonia" or "Tartu", then this looks like "oww, look those foreign, maybe russian, cybercriminals!". Anyway, this is old and dead horse, what gets beaten, this infamous estdomains a.k.a Rove Digital (if anybody want proof, look Figure 1 in pdf and compare rovedigital.com). This article tries make impression, how in estonia this ISP is legal or somewhat "known and normal" business. In fact, i never heard about those guys before first scandals and court case, i afraid they don't have much business (legal or other kind) in Estonia.