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Resolving a bounce condition requires action on the member's side of things. They or their email provider have to do something so that the provider does not bounce incoming emails sent from groups.io.
Until that is done, bounce probes are useless (other than proving the messages are still being bounced).

Especially if the Subscribe/Member never sees them.

There is good explanation here -> /g/GroupManagersForum/wiki/Help-Mock-up#Bounce-Handling

Understood, interesting - but useless to Subscribers/Members if they never see, read, or understand them.

The member sending an email to groups.io would not do anything as groups.io cannot do anything about the member's email provider that is bouncing the emails.

It would resurrect an account from the ‘virtual limbo’ and restart trying to deliver messages to the Subscriber/Member again.

I see the GroupName+unbounce@... email address as having the exact same effect as responding to a Bounce Probe, without the often insurmountable burden of the Subscriber/Member having to find the likely also mis-marked as a SPAM message Bounce Probe email, as it would be in a message from the Owner’s private email address and likely would have been received in their Inbox.

Plus if anyone, not necessarily that particular Subscriber/Member, had successfully interacted with that Email Provider to recognize Groups.io as NOT as SPAM ENGINE, such a Subscriber/Member would be all set. My thought is that most of us use Email Providers that other persons also use, meaning that not every client of every Email Provider that incorrectly labeled Groups.io as a SPAM ENGINE would have to educate every Email Provider.