I think blaming a comics industry crash on "not being formatted and available for phone screens" is, uh,
have you seen the Western comics industry? All it does is blunder its belligerent way into entirely predictable periodic crashes
Likewise, blaming the decline in MCU popularity on the same is, uh,
those same people are running the MCU? And have been faithfully recapitulating the predictable comics industry crash onramp with it
(Big Two indifference-slash-hostility to phone-readable comics is probably a part of the big picture, but it's not the root problem, just a symptom of the management failures that are)