In my opinion, Marseille does not need to take any risks regarding Pogba, because he has already served the sanctions that have been imposed. This is just doping and nothing more, there are still many cases of other players who have been sanctioned for harassment and gambling. So if you think about it, doping is still lighter because it only harms yourself compared to the 2 cases above. Well now Pogba is free, his performance condition is not yet certain, just wait for when he plays on the field. It doesn't matter if he plays with Marseille because for now Pogba is lucky to have a club that wants to accept his arrival. Juventus decision is right, they work well follow the rules and are more focused on welcoming a new future with the next generation.
Yes, the case is not too serious but still his reputation is already considered bad by some people but if Marseille is willing to accept all the risks it is not a problem, Pogba will definitely be happy because there are still clubs that want to accept his arrival giving him a little hope to enjoy his career as a footballer again.
Now regarding Juventus' decision to terminate Pogba's contract, it seems they have thought it through carefully, they don't need Pogba anymore because he is caught in the case even though Juventus actually suffered a loss because while he was serving his sentence Juventus still gave the player a salary and now that he is going to return Juventus doesn't want him.