stream apple tv+ from macbook to chromecast or roku

I may be missing something but if you have a Roku, why stream AppleTV+ to it from your Mac. I watch Apple TV+ just by using the Roku.

Also see: https://support.roku.com/article/360036652634

You would unless you move it back and forth between the two.

They're on sale right now -- $39.99 for a very good 4K streaming stick and $24.99 for the cheapest model.