MUBI is a film streaming service built on a rotating selection rather than a catalogue. One film is added each day and remains available for thirty, so the library at any moment is around thirty titles.
That constraint is the entire proposition and it is worth taking seriously rather than treating as a limitation. A large catalogue transfers the work of selection to the viewer, and the common outcome is a long browse ending in nothing being watched, because the cost of choosing rises with the number of options while the benefit of choosing well does not. A fixed rotating selection removes that decision almost entirely, and the trade is that the choice was made by somebody else according to a view of what is worth watching rather than by an algorithm optimising for time spent. The selection leans toward independent film, international cinema, restored older work, and directors with a body of work rather than individual releases, and the service publishes writing alongside the films that places them in context, which is closer to a programmed cinema than to a streaming library.
It is a poor fit for anyone who wants something specific on demand, since the thing you are looking for is almost certainly not there. It suits the opposite intention, which is to watch something good without deciding what.
Link: MUBI on Google Play