what does the following function do "Auto opt in new users for Two Factor via Email"?

what does the following function do "Auto opt in new users for Two Factor via Email"?

It's a security meassure to make sure, any profile related action (changing email, changing password or even chaning avatar) requires a secondary factor in addition to the current password by default, even if (Google/TOTP) 2FA wasn't explictly configured by the user.
The second factor will be sent to their email, which they then have to enter in Rocket.Chat to confirm the action.
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