Police and intelligence agencies have long worried about the risk of communications 'going dark' with encryption making it impossible for law enforcement to eavesdrop on criminal or terrorist plots. Critics of this approach warned that, because most digital services use encryption for one reason or another, deliberately creating backdoors would cause more damage to society long-term (by increasing the risk of letting in crooks and hackers) than the inability of the police to read a few messages. Australia and the UK have introduced laws that could require tech companies to strip encryption from communications – how effective this legislation will be remains to be seen. Even in the unlikely event that tech companies might be willing to allow the NSA or GCHQ a ghostly ring-side seat on every conversation they want to snoop, many firms would still want to refuse that capacity to other regimes around the world. Beyond this; strong encryption is effectively a commodity now, which is easy enough to implement, so it's very hard for any government to clamp down on all encrypted apps.