Henry must be paid by some competitor to Yahoo.com, You are spreading fear. The right advice would be to ask users to change their password. Instead you look at actions to destroy a company. Shame on you.
I for one will definitely not change from yahoo.com to another vendor. Gmail, outlook. facebook, twitter, have or will have had their billions of password acccounts hacked and copied. When did someone publish an article explaining how to quit that list of vendors?
I find yahoo.com's email services second to none, the interfaces are innovative, easy to use, reliable, and non-toxic. My 94 year old grandfather tried using outlook, gmail and found yahoo.com most intuitive. I find yahoo.com all of the above and most robust.