If it's so easily done, then most FTP websites would be hacked every week. But hundreds of millions of people have FTP websites and never get hacked in decades.

If it's so easily done, then most FTP websites would be hacked every week. But hundreds of millions of people have FTP websites and never get hacked in decades. I challenge you to select any FTP website of your choosing and make a tiny change to prove that you've hacked it and let me know here.