Is it any beneficial if there's a way to detect if a given IP address is bad or not right from the get go? Possibly by searching through millions of IP addresses that are blacklisted through a bloom filter and REST API? Do you think this would help-> a long roster of abusive IP address databases?
Depending on how you are presenting the data, you might also find it helpful to impose a rate limit (accept only a certain number of requests from a particular IP address within a given timeframe).
Of course I would start off by ironically scraping proxies from public domain as those are often used. Not sure what else determined scrapers use to get data, but it's safe to say that 98% of scrapers are trying to pay as little money as possible and often complain when a scraper gets blocked...fuck these people seriously
Depending on your method of blocking browsers, it might automatically lump Iceweasel together with Firefox and Chromium together with Chrome. But if this is something you really want to do, you have to be very careful about these things.