Why Mel Gibson doesn't want you to see his new movie
I don't know if this lead to fewer and poor reviews. Mel wanted to film at Oxford, increasing cost.
https://www.digitalspy.com/movies/a26823219/mel-gibson-professor-and-the-madman-movie-controversy/
It all stems from a lengthy legal battle that started back in July 2017 when Gibson sued co-producers Voltage Pictures for "jeopardising" the movie.
He alleged that the company had failed to honour their co-production deal, which stated that things like the final budget, selection of filming locations and the finished version of the movie had to be agreed by Gibson and his company Icon.