Yarvin isn't, to my knowledge. It's a matter of how they communicate on the platform, vs off. It's entirely feasible for them to present their more anodyne content on the platform, while still expressing a wider range of ideas and opinions off of it. This has been the smartest strategy for a while. Twitter doesn't usually care what you do outside their platform.

> It’s a matter of how they communicate on the platform, vs off. It’s entirely feasible for them to present their more anodyne content on the platform, while still expressing a wider range of ideas and opinions off of it.

Greenwald’s Twitter is no more anodyne than his substack; the only real difference seems to be the usual kinds of adaptation to microblogging vs. long-form.