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Re:Twitter accounts are being hijacked for spam by lozenge on Sunday May 26, 2019 @12:57PM (#20015891)
For ads they can verify domain ownership (TXT dns record, or verification file or HTML meta tag served from your domain).

For links in Tweets, they can show the actual URL (domain part at least) instead of the t.co shortened URL.

Re:Twitter accounts are being hijacked for spam by JetSpiegel on Sunday May 26, 2019 @03:08PM (#20016785)
But not using t.co means Twitter doesn't track every single click on their platform, defeating the purpose.