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Spamming comments is frowned upon by the community.

Comment spam is currently defined by @steemcleaners as:

  • 10 or more generic comments per day that are not in response to a question posed by the post or comment. “Thanks”, “Great Post!”, “Great Photo!”, “Good”, “Like”, “Nice”, “Wow”, “Cute”, “Follow me”, etc.

  • Commenting on old posts to hide self up-votes or a voting trail.

  • Copy/Paste comments that serve no purpose or the purpose is self promotion (including copying and pasting similar comments in rotating way).

  • Comments that inform the contributor that they have been up upvoted, resteemed, or flagged when the curator does not actually upvote, resteem, or flag the post.

  • Unsolicited and off topic referral links.

Continued comment spamming may result in action from the cheetah bot.

More Info: Abuse Guide - 2017.

How about giving a vote? Comment spammer

@steemcleaners is there to remind the rules and apparently there is a user who spams people's post so he reminds him not to do it and why;)

Yeah, there are hundreds of these comment spammers. It is a plague.
steemcleaners tries to keep an eye as much as they can but they are generally overwhelmed by the amount of abuse on Steemit.