Secondly from 2000 - 2018 the internet went form having ~17.000.000 unique domains to having ~1.600.000.000 unique domains. see: https://www.internetlivestats.com/total-number-of-websites/

The performance for desktop computers have actually not increased as much as you would think: https://www.karlrupp.net/2015/06/40-years-of-microprocessor-...

Your assumption is correct if you look at supercomputers, where the fastest in the world in 1999 could produce ~2.3 TFLOPS and in 2018 it could produce 122 PFLOPS which is around 5000 times the increase in FLOPS.

But i doubt most of the people you would want to go through this index has access to a super computer.