They also wrote me they dropped some keywords, it doesn't matter anyway to me, since I don't use them for months now.
Last time, after poor conversions (and I used to earn a lot with them in the past), I added $70 from a sponsor rewards, and it made no income to me, so I dropped them, as I got more and more free SE traffic.
They even told me to put $20-25/month as a minimum according to their terms, to avoid the deletion of my account, I didn't add any money, but the account is still there - I bet they will not delete soon
They still need customers and money, but they probably delete keywords that are likely to draw them into costly legal problems.