I've talked to a couple of people who don't use Manifold because a Google or Apple account is required for sign-up.

This resolves YES if at any point before close time it is possible to create and sign into a Manifold account without an account with any particular other service. Requiring (e.g.) an email address is OK.

Older market: https://manifold.markets/hamnox/will-manifold-markets-add-nongoogle