I think this Oxford student sums the issue up quite well.
I learned nothing much at all from this verbose British toff, but some points to acknowledge:
-His focus was on social media cancelling... which is ok, but a different form of cancelling has happened throughout history and he did reference history in the later part of his monologue here. But ok.
-I found he used 'ethical' when it was really an examination on public 'morality'. Maybe he meant that it purports to be about ethics, not sure.
-Social Media is a machine with unauthorized destructive potential - YES 1000X YES. However McLuhan pointed out that all technology is this. For example, the automobile destroyed cities, neighbourhoods and cultures and no one suspected that would happen.
-His view on the morals of the future is apt, but Hegel pointed this out in the Philosophy of History 200 years ago
Edited to add:
Is cancel culture effective in changing behaviour ? He says it's not but I think morality is the MOST likely communal aspect that can be expected to adjust to new technology.
Also - there's a problem when we talk about these phenomena generally without examples: are we talking about Don Cherry ? J. K. Rowling ? Noam Chomsky ? The Dixie Chicks ?