"Open source" attached to a video model can mean four different things: published weights, a permissive licence, runnable on consumer hardware, or simply free to use through somebody's API. They come apart constantly, and the gap between them is where most of the wrong advice about self-hosting lives.
This site checks one family — Alibaba's Wan — against all four, generation by generation, and then does the arithmetic on whether hosting the open one is actually cheaper than calling the closed one. It is not.
If you searched for "Wan 3.0 open source" and landed somewhere that implied you could download it, here is the actual state of the family, with the line drawn in the right place.
The self-hosting argument for video models usually rests on an assumption nobody checks: that an open-weight model, run on rented GPUs, is cheaper per clip than a current commercia
"Open" is doing too much work in this category. Here are the four distinct claims it gets used for, in decreasing order of how much they give you, with the test for each.