Web of trust weakens anonymity, but doesn’t eliminate it.

- You know who your online invitees are, but not your invitees-of-invitees-of-…

- You can create an account, get it invited, then create an alt account and invite it. Now the alt account is still linked to you, but others don’t know whether it’s your friend or yourself. (Importantly, you can’t evade bans with alts; if your invited users keep getting banned, you’ll be prevented from inviting more if not banned yourself)