I hate to be the bearer of bad news, but I really don't think there's much you can do. Sure, you can chase these fools all over the net, but (i'm sure you realize) it's inconsequential to move to another host faster than you can slap them with copyright infringement each time.
There are a ton of underhanded things you could try to do (like creating honeypot content that they'll scrape and hurt themselves with or you can drop their links all over other link farms hurting their position on search engines that care). But I think you're time is better spent elsewhere and wait for Google to handle it appropriately. Your friend is probably only losing revenue because their site can still be found on search engines. So getting them delisted will be your most productive steps.
There are a ton of underhanded things you could try to do (like creating honeypot content that they'll scrape and hurt themselves with or you can drop their links all over other link farms hurting their position on search engines that care). But I think you're time is better spent elsewhere and wait for Google to handle it appropriately. Your friend is probably only losing revenue because their site can still be found on search engines. So getting them delisted will be your most productive steps.
I'm empathize.