Kill Switch update: The issue affecting Baermar Uraz's Ugly Sweater has been fixed and the cosmetic has been reenabled in all queues with this update.

How do DC bots affect MMR? Do they?

That question has never truly been answered and does require clarifications.

Does killing bots (or them escaping) affect Killer MMR the same way a human player would?

They are obviously, in general, less skilled than the average Survivor (outside of certain loops where they simply can't be mindgamed). So perhaps they count as a Hatch escape? No MMR gain or loss?