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More than. I was running adguard "hole" on a 2B over ethernet, a 3B is going to have computing power to spare for additional tasks if you so choose
I ran PiHole for a year on a Pi Zero W, before I eventually had to move my DNS server outside the network due to other requirements
I’m still running one on that, been going since they first came out.
And what about installing this plus Jellyfin or something similar?
I used to run Plex on a 3b+ and it couldn't handle transcoding at a reasonable quality - jellyfin would presumably be fine as long as whatever device you are streaming from can handle your native file format (my library was x265, so I had to use the Plex desktop app because Firefox doesn't support x265 and required transcoding)
Probably not. 3Bs are pretty old.
Jellyfin happily runs on a pi, but really only for direct streaming.
You're generally better off just making the pi a samba server and connecting to it in Kodi. For jellyfin, you really do want a 7th Gen Intel or better (old 7100t-based thin clients are «chef's kiss»).