In the simplest form: Revideo is MIT-licensed. That basically means that you can do anything you want with our code - you can modify it, fork it, build commercial products, resell it, etc., without owing us anything.

While you can look at Remotion's code on Github (that's what we mean by source-available), the project has a custom license that doesn't grant you the permission to do anything you want with it. Remotion retains ownership of the code (i.e. you cannot simply fork it and give it away for free), and when you are a company with more than three employees, you have to pay Remotion if you want to use their code to render videos

This is the one of the clearest explanations of the differences between the licenses I've seen, thanks!

A more restrictive license ?

Remotion has a custom license that requires you to have a Company license if you don't meet certain criterias for the free license.

Revideo just has the MIT license.