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If everyone was spread out onto different instances, and communities were based all over the fediverse, the decisions of one instance would be less impactful.
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this post was submitted on 15 Aug 2023
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IPs change constantly, MAC is per network device (a laptop with Wi-Fi and wired has two different MACs), so you would need to be able to have a list of MACs and MACs can be easily spoofed so thats a whole other set of issues.
Another interesting thought about MACs and any other chip-based IDs that get floated in the future. Spoofing aside, while MACs are supposed to be unique, there are a lot of dodgy mfgs that just burn the same MAC or set of MACs into entire batches of chips at a time. If a new standard was announced, it would be interesting to see the results of orgs trying to take advantage of the ID while shady mfgs continue to not give a flip.
The vast majority of ethernet devices can be set to use any arbitrary mac address
MACs are "supposed" to be unique identifiers baked into the network chip, so it's partially a matter of how hard they work to make any other IDs spoof proof.