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A public IP address is (by definition) public. If you're behind CG-NAT you don't get your own public IP and if you have a public IP but not a static one then restarting your router will change it. I don't think there are many cases where an instance knowing your public IP is an issue. Lemmy instances hotlink media from other instances so many different instances get your IP just from browsing Lemmy.
This is a different conversation but if your account is meaningful then this should be a real concern. A month ago there were about 80 instances, now there are nearly 1000. How many of those will still exist in a year?
I am aware of how a public facing IP address works, and how little information it does give, by itself. It is still a privacy concern, and can be used in conjunction with other data to launch social engineering attacks or to help narrow down other data.
Possibly, but you don't have to be an admin of the instance the user is on to get their IP if thats what you're trying to do.