I am sure we have all noticed that hits to our sites are increasingly showing a greater number of the above-referenced mobile device UAs.
From time to time I grab a number of these UAs and check their IPs to see if they are scraper/scammers, etc.
To date, I have yet to find a bad guy.
Are my efforts to identify scrapers with such UAs poorly done, or is this rather fertile field for scrapers not yet being used to any significant extent?