With enough motivation, competitors can reverse their efforts. Reversing (competitors' job) is finding just only one flaw in a system. Hardening (WhatsApp's job

With enough motivation, competitors can reverse their efforts. Reversing (competitors' job) is finding just only one flaw in a system. Hardening (WhatsApp's job) is thinking about all the possible ways it could be flawed. It can be an endless cat and mouse game though I guess.