I was planning on moving over to fast mail over Labor Day, not so sure now.
Australia seems like precisely the right-sized society to be affected by pushback against this sort of behavior without being large enough to overwhelm outside opposition.
The first three are just copied and pasted from this article: https://www.linuxjournal.com/content/foss-software-alternati...
I've used (am using) Zoho for a domain of mine. It doesn't see a lot of use - but it's worked whenever I've needed it.