Earlier quoted context omitted.
Say you or a friend has an account in good standing. Get an invite link with a unique token. Sign up with the link. Done. The inviter doesn't know the username of the invitee. It's only visible to the moderation team who invited whom.
Assertion: A throwaway account is probably more likely to be banned than an identified account -- why else would anyone bother with throwaways? If the throwaway account is banned, the original link-giver would lose their good standing. (sorry, I should have highlighted this to the original reply) We can argue about whether the assertion is actually true, but even the perception that it might be true will make people…
Case 2: Your assertion is incorrect. There is some other reason for making a throwaway (like talking about a former employer, for example) and the system works as intended. The throwaway doesn't get banned and nobody gets their account demoted.
Also these demotions could have a time element to them, where you can't invite someone new for, say, a year.