What is a word or phrase for an apology made after you've already reaped the benefits or escaped the consequences of an action?

Solution 1:

Offering an apology after reaping the benefits or escaping the consequences goes to an apology that is:

insincere: not honest in the expression of actual feeling; hypocritical. (Dictionary.com)

disingenuous: lacking in sincerity; falsely or hypocritically ingenuous. (Dictionary.com)

hollow: insincere or false. (Dictionary.com)

pro forma: made or carried out in a perfunctory manner or as a formality (M-W)