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Protonmail's terms of service are better than Fastmail', IMHO. Fastmail TOS says that your service can be terminated anytime whatsoever on the whims of fastmail, whereas from what I remember, protonmail's TOS atleast laid out conditions under which your service could be terminated, like doing something illegal.

They offer both free and paid accounts.

https://protonmail.com/pricing

They have several tiers, including a free tier. The free tier is pretty limited; I wonder what percentage of their userbase stays there.