The whole Internet is a big spam. You think you can eliminate or control spam, you are delusional. Second, I can assure you your dear steemit will end up with less than 500,000 users by the end of this year because people like you who go out of his way to harass other users. If they want to post spam so what. The internet should be free and people like you should find something better to do than to try to control spam. pfff delusional

In the same way you control spam then have a look at Hive account@welcoming that crap falls exactly on what you call service comments