There are apps which instantly calculate earnings. Instantly register hits. They’ve been available for ten years or longer.
So why don’t modern sites use them?
Think of it, in those ancient days sites were honest and legitimate. One’s earnings were clearly visible at log on, and there were no ‘thresholds’. One was paid on a specific date every month, regardless of earnings.
The Site Owner did a 50/50 and was upfront about it. The user would be told the site paid 1c for every twenty hits. It was clear that the site received 1c for every 10, which allowed the owner to make that 1c.
Today, few sites come within miles of being honest.