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Residence decides which offerings you can be shown at all, so keep it current. Changing it does not change a holding you already have.
Statements and offering notices only. There is no marketing list. You can be paid for introducing a business to a subscription, which is ordinary software referral — but never for bringing somebody into an offering, because the UK banned refer-a-friend on cryptoassets in October 2023 and paying for introductions to an investment is a regulated act nearly everywhere else.
Your password is stored only as a hash and cannot be read back by anyone here, which is also why it can only be replaced, never retrieved.