It wasn't the platform. As you can see, it took some time, but Trump found a way to do the same without Twitter. Despite all the efforts of Big Tech to control the access to public discussion, they still can't make it airtight, and contain somebody of Trump's caliber. Arguably, they have more luck with people of the smaller caliber though. And that's definitely not a good place. It's not about the specific guy, it's about how eager the Big Social turned out to be to control what we think and what we are allowed to talk about.