Honestly, at this point, I’m not sure what you hope to achieve by these responses. Their account is marked as a bot, and for anyone who doesn’t want to see the reposts, the block button is just a click away. I, and I’m sure many others, don’t habitually go to reddit, so this is “new” content to us.

Obviously I’d much prefer if they added even a modicum of original thought to their posts, but the constant campaign of posting screen shots is equally wearing. I’ve seen your argument elsewhere that they’re ‘monopolising’ communities, but even if that were a meaningful metric, this isn’t the way to deal with it. Downvote them, certainly, but more people posting more content is the natural antidote. It doesn’t really matter that someone is reposting from elsewhere when there’s other content appearing too, and if there isn’t that other new content, even reposted content helps drive engagement in the community. Ultimately, if the mods of the community don’t want them posting, they can just block them from doing so, so it may be worth contacting them to register your dislike of this sort of content.