once a precedent is set, a transient acceptance of the action is established as a prior act.

you don't re-cork that genie, that's the whole idea of the slippery slope argument.

forever-more when YouTube considers an action towards something it can always now be said .. "Well in the case of X we did Y."

The 'slippery slope' isn't referring to the actions committed themselves, it's referring to a pattern of acceptance and renormalization that occurs after which biases the decision-making group into further actions of a similar vein.