Donna,
In my case, I don't think the offender will try that but, even if she
does, my group requires approval and I can just get the IP off the
application.
While sometimes better than nothing, note that using an IP address to identify someone has limitations.
On the false positive side, often an entire household, office, library, dorm, or other location will use a single IP address at its internet router. In some cases entire cities can be behind a single IP address.
On the false negative side a person may be able to be assigned a new IP address as simply as turning their cable/fiber modem/router power off and on again. Or they can temporarily use their phone as a WiFi hotspot. Or they can go to another location. Or they can use a VPN (Virtual Private Network) to route through a different IP address.
All of those, the false positive and negative, are probably unlikely for most would-be group members. But someone persistent enough may try those if they find that simply getting a new email address didn't work.
Shal
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