A new policy on adult content from Google means tons of old blogs, will be effectively deleted. 
“If your existing blog does have sexually explicit or graphic nude images or video, your blog will be made private after March 23, 2015. No content will be deleted, but private content can only be seen by the owner or admins of the blog and the people who the owner has shared the blog with.”
In June 2013, Blogger made a change that banned monetizing adult content and removed blogs that had ads for adult sites. However, as long as you weren’t trying to run ads, it was fine to have adult content.