FWIW, the banned chatters can only send one unban request, ever, unless you unban them and reset it. We're getting a small flood at first too, but only one per banned person. There's a finite number of those, and eventually only new bans will be potential sources of unban requests. And, the "spam" is only visible to mods, so at least you got it out of your chat and limited it to one more message ever.

Obviously, yes, like most creator features on Twitch it needs an off switch for those who don't want it. Some channels hand out more permanent bans than others.

I prefer to offer a single second-chance if your unban request sounds sincere and apologetic, and for that the unban requests feature is perfect. Way better than whispers, which are now discouraged by the inability to acquire a channel's modlist after your account's been banned. It's just... Geared towards only one kind of channel moderation and leniency, the one I use.

I think a few tweaks (OFF Switch, API access, Alternative Unban Link for people who have their own forms, and a more thorough user history) could make it extremely useful.