Formatting of reward amounts is weird

on https://github.com/google/security-research/blob/master/kernelctf/rules.md, formatting the rewards amounts to 3 decimal places is just awkward. On that page, I see the following reward amounts:

* $21.337
* $10.000
* $20.000
* $21.000
* $10.500
* $0 to $20.000

This is really confusing, as the separator for whole vs fractional numbers differs by region: https://en.wikipedia.org/wiki/Decimal_separator

For those that are used to using a period "." as a group separator for large numbers, someone could read "$21.337" to mean "twenty-one thousand... dollars". If that is the intent here, I would maybe not use the USD symbol, as most people assume a period "." is used as a decimal separator.

Most people use the hint of only having 2 decimal to know which format you are talking about. If this page is indeed treating "21.337" to mean "21 dollars and 337 cents), I would explicitly state that or change the formatting of these numbers.