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Roku OS home screen is getting video ads for the first time
(arstechnica.com)
This is a most excellent place for technology news and articles.
It's open source, so you're right, it won't. I use mine as a jellyfin box.
I haven't followed this guide so can't comment on how up to date it all is, but looks like there are addons to stream Disney, Netflix, and Prime at least: https://www.makeuseof.com/tag/netflix-amazon-video-plex-raspberry-pi/