Earlier quoted context omitted.
In some sense of the word they are already shut down. Moderation is very heavy on both and certain topics just can't become widely shared. For example, a recent thread by a sex worker had something like 8/30 tweets censored off the platform (despite none of the content being graphic, offensive, or illegal). So sure, Twitter will run for a long time. But it doesn't have very strong guarantees to its users about how it…
Neither does any point on the Fediverse. As long as operators think they can run their site any way they want instead of obeying a common protocol then they're federated in name only. To put it another way: If I can never trust that my email will make it to someone on gmail due to the opaqueness of their spam filters, with no way to be whitelisted by a recipient, then email has been thoroughly decommoditized and cent…
I disagree with moderation decisions made by many instances, but if they made no moderation decisions, I would not be able to use the Fediverse. So I'm glad of it, even if it's a pain sometimes.