It's extremely hard to coach non-technical users into making the right call when presented with a security warning box.
That said, if Twitter can assess whether a posted video contains "sensitive material" (i.e. exposed body parts), they can also assess whether a jsfiddle link (or any link, really) likely contains crypto miners.
And not presenting them with any call at all is guaranteed to keep them non-technical. We have to take the training wheels off at some point.
You can already see some of this in things like DRM and adblocking, and of course the various walled gardens.
Mainstream software is all about keeping users blissfully ignorant and consuming.
It's about whether they should trust their users and believe that the latter can take responsibility for their own choices, and figure these things out themselves.
You're just begging the question. Why should they do that?
Enlighten me. I could assume the worst of your intentions as you've done, but I'm honestly interested in why you think it makes sense for Twitter to "trust their users" to "take responsibility for their own choices".
You're making the user answer a question they (generally) don't know the answer to and don't want to answer anyway.
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>Twitter is rejecting posts with JSFiddle URL inside.
>If a URL shortener is used the unsafe page warning is displayed[1]