[Switching vendors] also applies to other layers of the tech stack (database, etc.) to various extents as well as to some other types of software, e.g. it’s trivial to export your bookmarks from one bookmark manager to another if they both have APIs or import/export capabilities — or, with a bit more effort, you can write your own.
What If Lock-In Doesn’t Matter So Much Anymore?
Another for the “how do we bring more portability and agency to the nonprofit tech stack” file. Those are also the things that bring negotiating power.