Banks have been choosing who they fund and who they don't for a while and it hasn't really been decried so far. This only highlights that we live in a society that is both democratic AND capitalist: decision making power is distributed, on the one hand, "equally" to each citizen via voting rights, and, on the other hand, to whomever holds the most capital.
You could even argue that the proportion of the power that goes to capitalists is inversely proportional to the amount of state actions in the form of redistributive policies, market legislation, etc.
Once you take this into consideration, your initial observation doesn't reflect a new financial "cancel culture". Rather it reflects how much of the decision making power is now in the hands of capitalists in the US.