Its fine to use Fastmail, many people have been making this incorrect and unfair assessment of the company. If anything the company is clear on how it’s standing up for user rights.
From Fastmail:
“As we have stated in the past, Fastmail’s business is not directly affected by this legislation and we won’t be making changes to our technology or policies in response to this act.
While we had a small number of customers tell us they were discontinuing service due to this legislation, as well as a handful of potential customers tell us it was impacting their evaluation of our services, the AABill did not have a material impact on our business. However, we shared these developments in our submission to Parliament as an example of the AABill’s potentially chilling effect on Australian businesses. Parliament deserves to know how the marketplace views their decisions.”
Ref: https://fastmail.blog/2019/02/28/aabill-and-fastmail/