Sort of, but not really. Stremio does allow you to watch certain content in-app but tends to work more as a hub for finding out how to watch specific titles. For instance, it’ll tell you where to rent new movies and direct you to that website, but you can’t actually play the movie in Stremio itself.
There is a community addon that lets you view content from Netflix, Disney+, HBO Max, and more in Stremio’s lists. Again, though, this simply opens a new browser tab and redirects you to the appropriate page. If you’d rather access this content in one place, you might be better off with Kodi, Plex, or something similar.