The staff are passionate about looking after these primates and do not see the centre as a moral issue. The fact that the animals need to be rescued in the first place is the real moral issue.
Interestingly, the centre's worse reviewers are those who expect a zoo run for the visitors benefit, and who complain about the ‘untidy’ enclosures (i.e. good climbable trees that make it hard to see any action) or the fact that a given primate might have chosen to sit quietly in a sunny area where it has good privacy, rather than perform on demand.
"As of 2016, 8.5% of the prisoners are in private for-profit prisons. Since 2000, the number of people in private prisons has increased 47%, compared to an overall rise in the prison population of 9%."
Source: https://www.sentencingproject.org/publications/private-priso...
So, if the annual increase rate has not change since 2016, as of 2019 about 9.3% of the prisoners are in for-profit jails. [edit: computed the rate, it is not "more than 10%"]