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