I am very glad to see this!
This could improve the quality of the comments.

This is a good, useful, helpful and beneficial bot for the community, like @cheetah.

Further improvement on the bot would be, if the bot would get a lot of Steem Power and flag these spam comments itself.

I think comments like "Nice post", "Nice photo" and "Please follow me" should be automatically flagged as spam (especially, if the authors of these comments are upvoted their own comments), as these comments are meaningless to the author of the original post and the writers of these comments are only showing the fact that they don't really care about the original post and/or the author of the original post, they only want attention (to their own profiles, to their own posts), so they are doing it for their own good.