When Did Ta-da Lists Start Showing Google Ads?

I’ve got an account on Ta-da List that I use for tracking some basic tasks. I stopped using it a month or two ago. Today I went back to my Ta-da account to look up some information that I remember tracking as to-do list. I was surprised to see that there were Google Adsense Ads on my list:

So is Google going to start supporting Adsense Ads on password protected sites? I’d imagine that ads on password protected pages is pretty commonly requested feature.

I haven’t found any sort of announcement or discussion on this, so perhaps this a recent change. Or did I miss something on the Signal vs. Noise blog?