If you’re interested, the short version is that instances (A.K.A servers) are run by different people in different places. A reason to move instances might be:
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My admin, the owner of the instance, has been doing things I heavily disagree with (bans, blocks, etc)
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I don’t agree with the rules on my instance.
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The instance is run in a country which criminalizes something that I care about, and so has to ban discussion of that thing (piracy, porn, etc).
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I want to run a community on a specific instance for whatever reason, and so need an account there
And then the rest of society has to pay for the healthcare. Don’t get me wrong, I’m very happy to subsidize or completely pay for the healthcare of those less fortunate than me via taxation, but that necessarily has to be combined with a protectionist attitude towards food standards to keep costs manageable.