A movie is intended to be watched as a single episode of 1.5-3 hours. TV shows are at least a few episodes long, generally an hour or less per episode but usually much longer in total. Seems a better differentiation than distribution method. Ask someone if they can guess if what you watched was a movie vs a TV show based on your description. Tell some people "I watched it via the internet", and some people "I binge watched 5 episodes" and see who gets the correct answer more often.