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.
It’s like screaming at a cashier because the supermarket head office made annoying changes to the company.
Occasionally your server deserves a bit of dickish behaviour because of their attitude, but this is relatively rather rare in my experience.
The cashier is a real human doing a job to put food on the table and has done nothing to deserve it, and may well have been far more hurt by the head office than you.
I'm noticing that Ad-Shield is becoming a continual fight these days with pageloads that complete then they fly in with a "ha ha here's a fake error report turn off your adblocker aye?".
Every time their live support chat is open (why would the anti-adblock firm even offer one), I send them Goatse.