I'd argue this paper is less a work of scholarship than an example of collusive, astroturfed, agitprop, where even though russia's oligarchs are an easy target because they are still new money and retain the taint of trade from the corruption that produced their fortunes, the authors are casting aspersions on highly regulated businesses that provide the financial rails for investing and preserving pensions and sovereign wealth.
The only reason you can insure anything or have long term financial instruments at all is because of special purpose vehicles that persist longer than the whims of a given regional governing party. These vehicles are infrastructure that provides financial stability for capital flows that facilitate social stability and growth. I remember the eurozone sovereign debt crisis', and to me the paper just looks like another (tawdry) setup for blaming "speculators and international financiers" for the failed technocratic policies of their peers own makings.
The approach of "going upstream," is guilt by association, and it's unprincipled overreach. The paper is entertaining, and I'm glad that the networkX python library has become so accessible that social activists can use it, but I think we should hold the authors to a higher standard.