But you just proved the point. You might not care to be signed up for some random Trump org, Scientology, or whatever, but other people do care and if you want

But you just proved the point. You might not care to be signed up for some random Trump org, Scientology, or whatever, but other people do care and if you want to author a website that responsibly uses people's emails without subjecting them to unnecessary spam, then it's worth taking these techniques (not necessarily this specific one) into consideration. While OCR does exist it's incredibly expensive compared to text scraping. The main way to combat spam is to make the cost of spamming more expensive than the benefit.