cause there is non and people should move on. The more high profile you are, the easier social migration becomes. Timestamp your stuff on a structural basis so you can reference back to your post history.
For some reason people got it into their heads that they should demand this impossible requirement, otherwise the thing is not good enough....meanwhile the potential of catastrophy exist in all sorts of ways in all sorts of systems and things they use.
If for some reason you still want to believe, you can look at the work over at inkan (npub16xn…6z6l)