I think what you want to do is UNSUBSCRIBE from the group, not DELETE YOUR ACCOUNT on Groups.io.
Deleting your account will remove you from every group you belong to AND also delete your account on Groups.io... unless you're the owner of any of the groups you subscribe to. Groups.io does not allow a group to become ownerless via unsubscription by the only Owner.
If you really do want to delete your Groups.io account, you need to replace yourself as owner of any groups you own... after which you can delete your account.
Jim H
Received from Frances at 3/6/2019 06:35 PM UTC:
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The Help says:
How Can I Delete My Account?
We're sorry to see you go, but we will be happy to delete your account. Note that we will not be able to delete your account if you are the only owner of at least one group. If that's the case, you should either transfer ownership to someone else, or delete the group before requesting that your account be deleted.
There was a discussion last year but the conclusion isn't clear to me. /g/GroupManagersForum/topic/22749972
The person who sets up the group cannot properly continue to be involved with discussions after his term is over.
Frances