If you are concerned about privacy and gov tracking and getting their hands on your email then whats the point of migrating from one "unsecure" email provider (gmail) to another one (fastmail)? With some of the fastmail servers in US jurisdiction your email is just as safe as with gmail.
In this case it was less about gov tracking, and more about the depth of the machine learning profile GOOG builds of its users. That being said, decentralising a bit to providers that don't specialise in user profiling but more in email handling, is a step in the right direction.
We get what we pay for. Free email is not free. The price is the security that we give up. Gmail and Fastmail are equivalent to me. Both own your privacy that you consciously give up for free...