I don't remember if he ever specifically downvoted based on the steem tag, so fair enough. I don't really care about 'tag abuse' currently anyway, as the UI for tags makes it not very usable. If I were to care about tag abuse I would have downvoted a ton of posts over it as such abuse undermined a couple of initiatives I was trying to support such as TIL. Hopefully the upcoming communities feature will be a better way to organize discussions on a particular topic.