When they rolled out the beta Microsoft said it wouldn’t be, but they could always change their mind with the general release. Excerpt from a previous Verge article about the beta rollout (theverge.com/…/microsoft-windows-11-start-menu-ad…):

“This will appear only for Windows Insiders in the Beta Channel in the US and will not apply to commercial devices (devices managed by organizations),” says Microsoft in a blog post.

Unfortunately, this article doesn’t actually quote Microsoft saying it’s rolling out to ALL machines. That bit in the article are from the author.