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The account was verified:
https://hivewatchers.com/verifications?utf8=%E2%9C%93&verification%5Busername_search%5D=gnericvibes

What about these accounts?

icolours
joymarshal
tenijrn

Those are not mine
They are friends and family I invited to Hive

They all post plagiarism and AI-generated content.

Okay let me tag them to this message to notify them

Thanks but they all received comments from us so they are aware.
It is the responsibility of onboarder to make sure that abuse is not brought into Hive. The onboarder is accountable.

Understood, how can they take down the posts that are in violation?

They can delete the body of the post so it is not visible on the frontend but it is never possible to remove the content from the blockchain. It can be viewed anytime using a tool.