Many text link sellers have observed a massive decline in their revenues in the last 8 years, because google is extremely aggressive in destroying almost all the text link ad networks
TNX.net was a russian ad network which offered inexpensive low cost text link advertising and an easy way for publishers to monetize their websites
However google, with Matt Cutts aggressively attacked TNX.net, penalizing their advertisers, and complaining in the mainstream media .
Soon it was not feasible for TNX to continue operation, and they were forced to shut down
Now there are very few text link ad networks, google does not penalize social media spam and marketing, sex, bribery rackets in the indian internet sector, it only attacks text link sellers.