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The potential for mischief, and worse, by way of spoofing is one of the stated reasons that Y!GMF has always had a 100% moderation policy.

On the other hand, spoofing someone else's address has become more difficult, and rarer, in the last 10-15 years or so as most email services have tightened up their policies regarding sending messages with an alternate From address. But a person intent on mischief most likely can still find a way.

I don't know to what extent Groups.io's incoming message process is locked down against spoofed messages, but I don't think I've seen any myself in any of my group's Pending or Messages. There are techniques to cut down on spoofing (such as SPF and/or DKIM authentication) but the more of that Groups.io does the more it runs the risk of rejecting legitimate members' messages.

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Whenever minors are involved the group's moderators need to be particularly vigilant about message content. If a moderator him/herself is a minor that's a difficult position, as then he/she is generally exposed to whatever comes the group's way. Same as the minor's email address.