Yours is not particularly problematic but I've always wondered how come advertising agencies allow highly controversial topics on their billboards in the US.
I know some (all?) EU advertisers deny creatives based on optics i.e. "our name and logo is on the billboard frame, we don't wanna get associated with topic X".
They like money. Controversial is not illegal. Slander is. If I purchase billboard space and spread defamation that will be problematic. The ISP could always take me to court but they would very likely lose provided I can prove I am telling the truth.
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