Recently had three of my accounts which I had since 2009 and 2011 for no reason. I haven't even been tweeting off them just keeping them active by logging in for the time being. I set them up as I was going to do a business site and support account but this didn't materialize, but I kept the accounts just in case. I wanted to log in as usual, and found them suspended. After numerous support requests a reason was never given. These accounts could not have violated any terms as they weren't active since at least a year and one had no tweets at all except a hello and the celebration ones you get each year from Twitter.
They want verification by phone now, which is absolutely ridiculous and uncalled for. Their stocks are down, well to change this they need to revert back to the simple site it once was, without all the "changes" to try and get more and more information and suspend accounts for no real reason.
Sure there are spammers, bots and those that violate the terms, yet it seems only the "good people" are being suspended and not the criminals and bad accounts.