I’m also getting 200 per response from followers/list.
I do see that the docs indicate a limit of 20 per page, which is sorta silly, given that such a limit makes it impossible to fetch a user’s entire followers list within the API rate limits if they have more than 300 followers.
You could, alternatively, use followers/ids, and then users/lookup, which has a (documented) limit of 100 responses per request, and thus fetch up to 1500 followers. #halfbaked