It's been on the hard to short list for a while. I use Scottrade, TD Ameritrade, Schwab etc,, and they all have it hard to short. I rarely short @ Scottrade anyway because they run such a Mickey Mouse show over there. I'm not even sure why I keep accounts with them. Diversification I guess. I've been selling the calls regularly since the 17-18 area. I do it less now with the stock down so much. I tend to avoid shorting below $10, even on a lousy performer like ANGI, simply because of the risk/reward ratio and it's easier to get your head handed to you.
Do you like IB? How long have you used them and what others do you use? I've been with Schwab the longest, over 30 years and they'll let me do things others won't.