I'd classify two of my bikes as hybrids, although they weren't originally.
One was a road bike that I converted to flat bar. At the time I had two other drop bar road bikes and really just changed it up for variety. Later, I tried to make it work for gravel, but the geometry made it too skittitsh for my liking, and I couldn't fit tires as wide as I wanted, so I gave up on that. It's the bike I keep on my stationary trainer now, but I still use it on the road occasionally. Is it a hybrid? I consider it to be one because of the flat bar, but some people might say it's just a flat bar road bike.
The other was an XC mountain bike that I switched to a rigid fork and cut the handlebar narrower. I use it for riding gravel when I know or suspect my route will be rougher than I care to ride on my CAADX. Some people might just consider it a rigid MTB, but that's not how I use it, so I consider it a hybrid along the lines of a Giant ToughRoad.