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Riseup is not a "free email service", you don't get an account easily. You have to request the account, and might get it or might not, the decision to grant the account is up to them to decide, Riseup might terminate your account if later on they discover your political affiliation is not of their liking. I think that their FAQ also makes clear that they are not a "free email service" but I can't find where it is written right now.

Riseup is an email service for left leaning activists funded through donations, not the same as a "free email service" like Gmail or whatever.