Earlier quoted context omitted.
Notice how the responses are honest ones, where people would rather skip the report than supply their real email address? The target demographic are tech savvy, so 90% of the leads are going to be 10MM email addresses. The popularity of this thread illustrate that there is a need/use for this content - so Cockroach nailed the bait, but have massively overshot the type of trap required to convert these savvy mice.
That 10minutemail workaround is easy to block, just require a business domain and a use a verification link.
Like many similar problems, it's a cat and mouse game. For example, it's equally easy to detect adblockers, but they are still really effective.