The dot damage is decided at the start, so removing curses doesn’t remove Bane’s damage multiplier.
Is this just for the curse count or for other damage modifiers as well? If I cast Bane and then start casting Blight or Wither with Infused Channeling, will the Chaos Infusion apply to the ongoing Bane damage?
I’m not entirely sure sorry, but it’ll be consistent with other dot effects so someone else might know!