Talking about the EU perspective in 2020 here: FCA (Fiat Chrysler and all of their brands) sold too few low/zero emission cars. Their fine would have been X millions of €. By paying Tesla X - 100 millions €, they save 100 million €, while being pretty pissed off that they are financing a different OEM.

Due to this reason, they already announced that in 2021 they won't need to "pool" with another OEM like they did in 2020.