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![](https://lemmy.dbzer0.com/pictrs/image/a18b0c69-23c9-4b2a-b8e0-3aca0172390d.png)
Did you check the md5? If they were different, it could be anything (it doesn’t imply modifications from massgrave either)
As for logic, bad actors would do anything. Even hijacking a server and replacing the ISOs of other hackers, or infiltrate the group and do so.
I downloaded huge sets from internet archive.