See I would define cult classic as something that was not popular at the time of release, but then slowly gained popularity several years on to the point of becoming mainstream in the present. The movie Office Space is a canonical example for me.
It's been on Hulu for a few years, just FYI.
All old shows should be everywhere.
Even 25 years later I see Seinfeld is on 11 times tomorrow with my cable package.
All seasons are on Amazon prime! I love to put on Seinfeld as a background show