That's not true. Definitely not true. The "cloud" hasn't weakened encryption because WhatsApp and Signal (more Signal than WhatsApp) use an open-source protocol that is zero-knowledge through transit. The guys running the servers don't know the contents of the communications. (I believe that WhatsApp collects metadata but Signal does not.)
Google's Android and Apple's iOS are not being deliberately bugged with back doors. For fuck's sake, Android is open-source. It is possible to compile Android from the source code to make sure there aren't back doors. Apple patched iOS ten days after it learned that a private spy company had compromised iOS. When the FBI wanted to force Apple to hack the iPhone, Apple went to court to stop them, and finally forced the FBI to pay a private company to break the phone.