I have an account that's older than some current reddit users have lived, I've pretty much never deleted anything from it but I plan to replace all comments and threads I've created on that account with something like the following text: "Removed in protest of reddits idiotic 2023-06-30 API rule changes."

Shreddit looks like a good tool for this, just have to tweak it so it doesn't actually remove the data, just replace and leave it.

Would be fun to also build a tool for restoring the content should reddit reverse its idiotic API decision. But why bother doing that when they wont...