Go to the IMDb login page on your phone. The choices of account are: IMDb, Amazon, Google, Apple. So while we're betting, I would bet most new accounts fall in

Go to the IMDb login page on your phone. The choices of account are: IMDb, Amazon, Google, Apple. So while we're betting, I would bet most new accounts fall into the last two. They offer zero-friction without another password to remember. Longstanding users have IMDb accounts that predate the Amazon takeover. So I'm not so sure as you are that it's that simple. You're also limiting it to one vote a family. So Amazon does have some data. They could probably infer some more from metadata. Perhaps those reviews should have remained, and if they wanted to do this in the future, a "verified purchaser" model might work Fairly-Enough™ but it still discounts many, probably most, fair reviews