

They’re active branches in most cities, but they can be formed anywhere, even rural areas. If there’s a local union that’ll take you in and isn’t corporate captured (teamsters being an example of corporate captured, IMO), then sure, that can work.
But the IWW is the only union that can unionize any industry, is global in scope, and is grassroots with a revolutionary spirit.
Another plus in favor of posteo is they will never delete or block access to your account even if you stop paying (you just won’t be able yo send emails).
That’s a very unique trait amongst the privacy focused providers. In comparison, mailbox.org will recycle email addresses after a certain amount of time of not paying, potentially allowing someone to impersonate you by claiming your old address.