The thing is... Amazon probably wasn't even gonna renew it for a second season. Let's be honest, nobody saw the show. So they teamed up with some producing company who along amazon put the money to make season 2, the deal was amazon would stream the show in Italy and the producing company would sell the rights to stream the show elsewhere to recoup the investment.
My guess is that no market was interested enough to buy it, so it ended up only available in Italy. The rest of us watched it illegally and there was no money recovered so they cancelled it.
Which is sad cause I saw more interest in season 2 than in 1. Nobody was talking on social media until season 2 was released. Had amazon released it internationally, more people would start watching it.
Kinda what happened with Industry, season 1 and 2 people paid little attention, but season 3 is a success, and it's also a co-production between HBO and BBC, just like amazon and the Italian production company.