https://www.reuters.com/article/us-twitter-inc-suspensions/twitter-suspends-over-70-million-accounts-in-two-months-washington-post-idUSKBN1JW2XN
That's a huge percentage. For the numbers to be that high there probably was very little policing before. I guess the inflated numbers meant more to them than quality control.
Better article:
http://www.philly.com/philly/business/technology/twitter-is-sweeping-out-fake-accounts-like-never-before-putting-user-growth-at-risk-20180707.html
They wiped my legit signup in the process.
Their situation must be grim where they're aggressively weeding out the supposed minor % cost of automated accounts taking up resources.