I'm using those proxies and I can confirm it's hard to get better CPMs with other proxies also I didn't notice those proxies to be banned on any website. If it comes to sqli dumping then I can easily get 50-65k urls in dumper.
If you wanna use them in sqli dumper there's a tip from me: If you can don't use those proxies when exploiting and analizying injectables as it send tons of requests and will use most of your bandwidth.
