Even though I agree, there will always be things that we don't own.

I'm developing my blog in Svelte, and I trust that (despite being kind of a niche framework) it will last for long. But if it gets abandoned by its developers then I'll have a problem.

The only way for me to own everything on it would be to do develop as much as I can by myself, like quit using Sass and Svelte in favor of plain CSS and vanilla JS, and also self-host it instead of relying on a VPS. And that's not even mentioning the dependencies of the API, which is made in Rust and its less mature ecosystem

I think that the path to software preservation is a long long road