You can write a 180 characters post\tweet\toot even when there is virtually no limitation.
I think this is what was asked by a parent commenter: why enforce any limit (except for a sane ones) at all?
IMO it makes for better content. I'm not logging in to a microblogging app so I can read thoughtful, longform content, actually it's exactly the opposite.
By enforcing a character limit you only allow a certain type of post to be made
https://schema.org/Recipe
LLMs are specifically good at a task like this because they can extract content from any webpage, regardless of it supports whatever standard that no one implements