They specifically brought up the example of Chaplain being fired as "canceling".
Also, your definition needs doesn't match common usage, or what happens. Here's a better one:
Canceling (n.): holding a public person accountable for their actions by withdrawing monetary support.
This can be done by not extending a contract; by termination of employment, contract, or the privilege of access to particular public platforms from which they profit, if the funding is provided on a contractual basis; and - wait for it -
Deciding not to donate thousands of dollars of your own money to someone is not "canceling".