

Irrelevant and refuted by Colbert’s own words, but ok. Viacom quite literally wouldn’t allow it.
https://www.hollywoodreporter.com/news/general-news/stephen-colbert-colbert-report-character-915236/
But on Wednesday night’s Late Show, the real Stephen Colbert indicated that Comedy Central’s legal team is barring his old character from appearing on CBS.
“This is true, immediately after that show, CBS’ top lawyer was contacted by the top lawyer for another company to say that the character Stephen Colbert is their intellectual property,” the real Stephen Colbert said on Wednesday.
He continued, “So it is with a heavy heart that I announce that thanks to corporate lawyers, the character Stephen Colbert, host of The Colbert Report, will never be seen again.”
The audience began to boo but the Late Show host insisted there was nothing he could do.
“I feel the same way, but what can I do? The lawyers have spoken. I cannot reasonably argue I own my face or name,” he said. “And as much as I’d like to have that guy on again, I can’t.”
He quite literally was legally disallowed by Viacom (Comedy Central’ owners). Not CBS, where he told the audience he would love to bring the character back but was not legally allowed to do.