Sometimes it seems like only GSA, PBN and WEB 2.0 that work, but the black hat technician from 10 years ago still work, look at the serps and close several cases of sites making black hat with techniques 10 years ago. Larger examples: link exchange, still working, everyone says it's footprint and one hour will be punished, but look at the serps and see several cases that are working still. Comments with your website address too, among others ... The truth is that black hat has changed very little in the last 10 years, and you can not believe what Google says, do not believe it! I'm Portuguese, pardon for bad English.