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Okay, having looked into it a bit more thoroughly: beta.argyle.social is full of copied accounts, exact - save for the lack of pictures - and I presume unconsenting copies of real people and organisations who have accounts elsewhere on fedi.

All the accounts appear to have lots of follows and followers, because they all follow each other.

You might want to look to see if there's an account in your name on that server? Although I'm not sure what you can do about it if there is.

There's also an alpha.argyle.social and a gamma.argyle.social - no other Greek letters as far as I can see.

Whatever it is, it's dodgy as hell and worth blocking the instances entirely.