For all we know, and this is in fact very likely if you ask me, the arrangement Raiola had that netted him 20 % of the transfer fee, was part of the deal that took Pogba to Juventus in the first place. These 20 % was not "robbery" as those terms were not set this summer. They were always part of the arrangement. No other explanation makes any sense in my opinion, as Juve would not have paid the agent fee unless they absolutely had to. And when a company absolutely has to, it has to be contractual reasons for it. So those 20 % to Raiola had to have been part of the initial deal (in 2012).
In 2012, a highly sought after young midfielder did not want to renew with United. Juve saw an opportunity, Raiola saw an opportunity, and in the end both Raiola and Juve got what they wanted out of this, and Pogba as well. Wouldn't call that robbery.
The fact that we're dealing with Raiola again just confirms this, imo.