I was in college at the time and had free HBO on the dorm cable network, plus completely unfiltered 100mbps ethernet throughout the campus. It was fun to have a "DIY Tivo" server that could automatically remove commercials and make my library available to my suitemates.
Used that for a while then went down the XBMC path (for windows..pre-Kodi for a while). Ended up with a Boxee Box (first real dedicated hardware). Then moved to Plex hosted on a Windows Home Server with various clients over the years (Sony NSZ-GS7 Google TV, OG Chromecast, Nexus Player, one of the older FireTVs, Chromecast Ultra).
The Home Server died so I moved to UnRaid with containerized Plex. Had a HDHomeRun Prime integrated with Plex for a bit. But dropped cable in favor of streaming TV services. That's the closest I ever got to a MythTV setup.
I ended up creating a barebones DVR from scratch in FreeBSD, which I was more familiar with than Linux. I kept adding incremental features over the next few years, until it was a very usable system, and exactly suitable for my needs.
Then the internet became fast enough to stream and download content, and the old workhorse ended up in a closet somewhere.