Thanks for the correction. you're correct it's 50 rulesets. Originally the limit was 5,000 rules but it seems the Chrome team backed away from that
Regardless it doesn't change the fact that these are static rules. It's trivial for anti-adblockers to dynamically get a url that is not in a ruleset. Without the dynamic logic that is allowed by the webRequest API we are completely dependent on static rulesets that need to be updated by updating the entire extension itself
The size of the rulesets is a distraction from the fact that adblockers can no longer run dynamic logic to filter web requests and block tracking
The maximum number of rule sets is 50, not rules, as your own link clearly and unambiguously states.
The actual minimum (not maximum) number of supported rules is 30,000:
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...
In reality, Chrome supports over 10x that. And UBOL doesn't even use/need the minimum, sticking to around 17,000.