Ending the public API also prevents reddit users from deleting their post history without manually removing each post.

If you want to scrub your post history and prevent reddit from profiting from your input, use Power Delete Suite while you still can.

https://github.com/j0be/PowerDeleteSuite

It is unlikely that reddit allows users to delete their content from the backend but this at least keeps your posts out of search results, which is a large part of their value.