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Own a Roku TV or streaming device? You're about to see a lot more ads on your home screen
(www.techradar.com)
This is a most excellent place for technology news and articles.
No need for HTPC, just a small USB device with HDMI output and DLNA support. You use your phone as a DLNA controller, a server running Jellyfin as DLNA provider, and the device attached to the TV as DLNA renderer. And sometimes TVs have DLNA support built-in (my Toshiba does).
On Android there's an amazing app called BubbleUPnP that can source media from a wide variety of places, make playlists, and cast to DLNA devices as well as proprietary protocols like Chromecast.
It works but it isn't family friendly.
Jellyfin supports DLNA too, if you have a DLNA rendering device on the network it will just appear in the cast menu. Or if you want something that works with a remote directly on the TV you can install Kodi. There's really no point nowadays in getting tied up into proprietary stuff.