On a related note, I'm annoyed at sites that typically let you delete your own content, but it's possible for you to get blocked from seeing it and then you can't remove it any more.

For example, if you post or comment in a Facebook group and then leave it, you can't remove those comments. Same if you comment on someone's post and they then block you.

On Reddit if you post in a private sub or a gold-only sub and later don't have access you can't delete or access it. I think you should at the very least be able to see your own content at any point, and if deleting is typically allowed you should be able to delete your own content.