As much as I love Fastmail, I think it's time to move elsewhere. I don't feel safe trusting a Australia based company with my online identity after all those hostile laws.
I'll be trying out https://mailbox.org/en as an alternative. They seem to have good PGP infra and are hosted in Germany.
The last somewhat (!) safe haven is Switzerland.
For attackers to passively surveil TLS en masse, they'd need to MITM those connections. That in turn requires rogue CAs signing the attacker's certificates in large numbers. If that happens, the public would notice and the CAs involved would be permanently banned. Not sensible if the attacker's goal is to carry out persistent mass surveillance.
Much easier to just obtain the emails directly from few popular email providers instead.