I think we aren't too far away from bring able to have a computer be the ref. With enough cameras and processing power computers will be way better at getting the right call. I'd welcome it
As far as this being a thing, we already had a huge scandal about exactly this. We know refs were shaving points and influencing the outcome. For a fact. To assume that because it isn't on the radar anymore that is doesn't happen at all is naive. I think refs change up how they call a game based on personal biases, having a bad day, bring pissed at a given player, on a power trip, you name it.
But it would not surprise me to find out there is some unwritten **** going on influencing the officiating beyond just making rule changes. This is a money-making endeavor and the league has been very very focused on the marketability of their product, especially during the Stern and Silver eras. And they will know what is needed to make a marketable product. So you better believe it is very possible that refs are instructed to increase the entertainment value of the product even if it is at the expense of making the right call.
I did some reffing at the Jr high level and a big part of our prep was a reminder that we wanted the kids to be safe first, and to have fun second, and to officiate to facilitate those 2 goals, even if it meant we weren't calling literally everything. Wouldn't surprise me to find out the NBA refs are instructed to maximize the entertainment value of the product first and foremost, even if it means purposely making or missing questionable calls.