> Every time their live support chat is open […], I send them Goatse.
Unfortunately there is little chance that a human is anywhere near the other end of that chat these days, so your evil is somewhat wasted.
> (why would the anti-adblock firm even offer one)
They want to appear to care. And appear to be a company of real people, who you might like if you met in real life, who will be out of pocket if you don't look at their ads.
If there is a person on the other end it’s not someone who has any link to the company, they’ll be an outsourced service, so all you’d be doing is sending graphic porn to a poorly paid worker.
It’s like screaming at a cashier because the supermarket head office made annoying changes to the company.