The trial is granted in the credentials signup route and on the
verification link, and an account created by Google or GitHub goes
through neither: the Prisma adapter writes it directly. Since checkout
no longer offers a trial either, such an account reached a locked
product and an immediate bill, which is the opposite of what the signup
page promised it.
The address is already proven at this point, because the signIn callback
turns away an OAuth profile that reports its email as unverified, and
the grant is idempotent, so nothing here can hand out a second trial.
yusufipek
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