How effective a PoW firewall is, depends on how conservatively the worst offenders configure their browser engine resource limits. A small scraper may be able

How effective a PoW firewall is, depends on how conservatively the worst offenders configure their browser engine resource limits. A small scraper may be able to afford spending the extra CPU cycles, but if you're like AI training bots, sometimes sending hundreds of browser instances at a time, the math becomes different. From what I've read about the results, it seems like the approach is effective against the very worst scrapers and bots out there.