I have a simple question, if I mistakenly post data such as my personal address, private key or any data that I later want to hide, and I contact @ and he delete it, will both sites comply with this deletion?
you obviously got satisfactory answers, so it wouldn't be a problem to delete posts that contain sensitive information. certainly, if that were to happen, you would have to react immediately by changing the password, removing the funds and stopping using the compromised private key, etc... once made public it became public forever.
That doesn't make scraping a bad idea, it makes posting private data a bad idea. People should really not post stuff on the internet if they want it to be private.
an accident can always happen, especially confusion when copying/pasting an address vs. a private key. once in a thousand times, but it happens.