IMO the fines are made to sound scary, and are relevant for large corpos, but the ICO or whatever body for your country, has no interest in prosecuting an individual. What is a ‘percentage of revenue’ on something that makes no revenue anyway.
Even if they did take interest it would start with an opportunity to correct things before prosecution.
My CDN bill recently went from about $5 a month to over $200. Turned out it was Tictok’s spider relentlessly scraping the same content over and over again.
It was ignoring robots.txt. In the end I just had to ban their user agent in the CDN config.