As I've always said, the NBA is a version of the World Wrestling Association.
From an article on Sportsnaut by Jesse Reed:
"The next year, Donaghy alleged the NBA had instructed referees to extend the Western Conference Finals between the Sacramento Kings and Los Angeles Lakers in 2002, among other instances, as a means to influence how long the series went. Ultimately, the Kings ended up losing to the Lakers in Game 7 after a ridiculously one-sided officiating performance by the refs in Game 6, which the Lakers won.
Many people saw Game 4 of the current NBA Finals as a game officials purposefully controlled so as to extend the series - Draymond Green’s mother included.
And according to Donaghy, that’s going to continue in Game 5 Monday night.
Dohaghy says the officials will probably make sure Green ends up in foul trouble early. He also concludes the NBA is going to do everything in its power to get the series back to Cleveland for Game 6, if not ensure it does everything possible to extend the series to seven games. He points to the ridiculous money ESPN paid for the rights to broadcast NBA games. Obviously, if the series is extended, it means more revenue for the league and the broadcasting company.
Whether you buy that story or not is up to you. However, given the way Game 4 was officiated so much differently than the rest of the series between the Golden State Warriors and Cleveland Cavaliers, we’re not willing to dismiss Donaghy’s allegations out of hand."
Home ref bias is already in the point spread. That's why home teams normally have -3 points or more when home versus road. It all baked in.