That's a blast from the past. OS/2 and Hobbes were essential back in the 90s when you wanted to avoid Microsoft OSes, as Linux was still pretty raw until the late 90s. I guess some never really felt like it was worth migrating, and fair enough!
There's a subset of the finance world thats very fond of both "commercial support" and "security by obscurity." OS/2, Alpha servers, they kept hold of lots of stuff 2 decades past its peak.