Because the other twitter terms and conditions on harassment are so well policed. That some people are concerned about screenshots instead of bullying, harassment, etc that we see every day on the platform is quite something.

Well, you often find screenshots ARE used for harassment in as stealth retweets that make it hard for the original poster to counter the re-contexting and perversion of what they wrote.

That happens all the time, so yeah - it is a tool used to bully and harass, used all the time upon twitter.

Why would they want to police it? Surely Twitter is perfectly fine with you posting screenshots of things of interest (obviously within obscenity and legal restrictions).

Because if users posting screenshots of fleets becomes a common thing, users would be averse to post fleets?

I don't know. Twitter reposts of TikTok videos seems ubiquitous, but it seems like TikTok is still thriving. I don't think the primary reason people post a story rather than a permanent post is that they want to ensure the story only lasts for a day. At least for Instagram, I think it's more about keeping your main feed highly curated while still being able to hammer out tons of stories.

Copyrighting tweets? I love the idea as a demonstration of the absurd extent of copyright, but I'd expect virtually no tweets to be considered copyrightable.

This idea has been looked at - https://copyrightalliance.org/ca_faq_post/tweet-protected-co... Seems that if you posted an original joke it should be copyrightable.

IANAL, but I feel like an original tweet to @bbcmicrobot should be copyrightable. Maybe adding a little © at the end to signal original authorship?

T&Cs stop at Twitter's border.