We created an article website 8-9 years ago. It was allowed the author could post a link to their website or related page to the article. All the links from day 1 were nofollow. Since the recent updates from G we have been swamped with link removal request. I had a prepared email letting these newbees know the links were nofollow and had no effect on their problem. Well some of the (most of them) don't seem to understand this, so I took a look at the website and determined it was of no value to our company and our future.
The website did very well in the serps but with the content I had taken off adsense to protect our interest, so really there was no viable income.
Best option kill it. Shame but I just don't have the time to worry with all the emails and the website making the company 0.