Dorsey calls Silicon Valley's response to online abuse a "huge fail."
Set to expand reach of its 'NBN alternative' services.
"PrivExchange" flaw fixed too after proof-of-concept published.
Tries to win customers that want greater flexibility.
Tighter controls could disrupt Russia's Internet and be used to stifle dissent.
Primary and backup data wiped.
Caused by undisclosed 'security vulnerability'.
Says change needed to protect "virtually every" smartphone and net user.