Let's be real about Milo.
Milo was a powerful figure in the alt-right. He was a writer for Breitbart and had a huge following. He got mixed reactions from white nationalists, the most extreme of the alt-right because he said he was part Jewish. Some of them didn't like him. But generally, the alt-right liked him because he was so provocative and could weasel his way into identity politics using it to attack the left and the alt-right loved this about him. For example, he called his college tour "Dangerous Faggot."
Let's not forget that he led the attack against Leslie Jones so bad, she was so terrorized that she fled social media for a time and went into hiding. Talk about canceled...
It's true that a lot of colleges had protests (free speech) regarding Milo and fewer movements to disallow him from touring. However, overall, Milo was NOT deplatformed by the Left. He was deplatformed by the Right, by the market, and by business overall. His biggest mistake was making positive-like comments about PEDOPHILIA, not his Islamophobic, anti-feminist or other alt-right views.
His comments about pedophilia led to his book being canceled by Simon and Schuster. He also had to resign as a writer for Breitbart and had to make it look voluntary. Breitbart is alt-right, nothing to do with the left. AND conservative groups like CPAC rescinded their invitations and general alliance with him.
IF Milo had not gone over the top about his Libertarian views on PEDOPHILIA, then he'd still be a writer for Breitbart screaming about cancel culture, he'd be a successful author, and a popular speaker especially at Reich wing events, though there'd be a few colleges where he might not be able to go (maybe?? I don't even know...), there'd be more where he could go and cause controversy thus making a big name for himself.