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Op, please post for some advice in a legal sub. IMO, the legal route should be your first step – especially considering some of the context you’ve provided.
If that doesn’t work out, come back to dmca takedowns/etc. But dmca takedowns could start a cat and mouse game, where as the legal route would probably shut the door a bit more firmly – and entitle you to damages if there are any shenanigans later down the line.
