I noted on twitter the UI for the auto bits has no restriction on time (ie refill X amount of times per month). This could be exploited on a compromised account that set up the auto buying of bits, as the bits would be spent and then twitch would automatically buy more.

Also people do get heated in a "bit war" and I could see this leading to issues where it it draws multiple times to keep the donation war going.

Simple changes would include: 1) a way to restrict how often bits can auto refill and 2) A confirmation box in chat to buy more bits when auto bits takes effect (ie like amazon's 1 click buy option).