My main concern isn't the 'Big Bad Government' but just good old fashioned incompetence and corruption. If law enforcement can read my messages so can engineer

My main concern isn't the 'Big Bad Government' but just good old fashioned incompetence and corruption. If law enforcement can read my messages so can engineers at the company, or anyone a hacker or disgruntled employee sells the data to. Those messages may contain sensitive information like financial details, passwords etc.