Heavily guarded fortress would indicate something of value inside, and the big crooks may spend a little more effort. In the age of AI, this becomes even easier.
True - but that cost just halved with today's introduction of "GPT-4o". The other cost is time.
IMHO - I think there is more to worry about than email scraping..
In no world is anyone wasting resources to run an AI model to parse a page that may or may not include an email address. Even running a DOM parser is more than they’d typically do. This is silly.